Steps:

package com.codingbihar.composepractice

import ...

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            ComposePracticeTheme {
                Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
                    EMIApp()
                }
            }
        }
    }
}

EMIApp

Build A game using Jetpack Compose for Beginners

package com.codingbihar.composepractice
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.material3.Button
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.material3.TextField
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.text.input.ImeAction
import androidx.compose.ui.text.input.KeyboardType
import androidx.compose.ui.unit.dp
import kotlin.math.pow

@Composable
fun EMIApp() {
    var principal by remember { mutableStateOf("") }
    var rate by remember { mutableStateOf("") }
    var tenure by remember { mutableStateOf("") }
    var emiResult by remember { mutableStateOf("") }

    Column(
        modifier = Modifier
            .fillMaxSize()
            .padding(16.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.Center
    ) {

        Text("EMI Calculator", style = MaterialTheme.typography.headlineMedium)
        Spacer(modifier = Modifier.height(20.dp))

        TextField(
            value = principal,
            onValueChange = { principal = it },
            modifier = Modifier
                .fillMaxWidth()
                .padding(10.dp),
            singleLine = true,
            keyboardOptions = KeyboardOptions(
                keyboardType = KeyboardType.Number,
                imeAction = ImeAction.Next
            ),
            label = { Text("Enter Loan Amount") }
        )

        TextField(
            value = rate,
            onValueChange = { rate = it },
            modifier = Modifier
                .fillMaxWidth()
                .padding(10.dp),
            singleLine = true,
            keyboardOptions = KeyboardOptions(
                keyboardType = KeyboardType.Number,
                imeAction = ImeAction.Next
            ),
            label = { Text("Enter Interest Rate (Annual)") }
        )

        TextField(
            value = tenure,
            onValueChange = { tenure = it },
            modifier = Modifier
                .fillMaxWidth()
                .padding(10.dp),
            singleLine = true,
            keyboardOptions = KeyboardOptions(
                keyboardType = KeyboardType.Number,
                imeAction = ImeAction.Done
            ),
            label = { Text("Enter Loan Tenure (Months)") }
        )

        Spacer(modifier = Modifier.height(20.dp))

        Button(onClick = {
            emiResult = calculateEMI(
                principal.toDoubleOrNull() ?: 0.0,
                rate.toDoubleOrNull() ?: 0.0,
                tenure.toIntOrNull() ?: 0
            )
        }) {
            Text("Calculate EMI")
        }

        Spacer(modifier = Modifier.height(20.dp))

        Text(text = "EMI: $emiResult", style = MaterialTheme.typography.headlineSmall)
    }
}

fun calculateEMI(principal: Double, annualRate: Double, months: Int): String {
    if (principal <= 0 || annualRate <= 0 || months <= 0) return "Invalid input"

    val monthlyRate = annualRate / (12 * 100)
    val emi = (principal * monthlyRate * (1 + monthlyRate).pow(months.toDouble())) /
            ((1 + monthlyRate).pow(months.toDouble()) - 1)
    return String.format("%.2f", emi)
}