SpecialDeposit

package com.epam.rd.qa.aggregation;

import java.math.BigDecimal;
import java.math.RoundingMode;

public class SpecialDeposit extends Deposit {
    public SpecialDeposit(BigDecimal amount, int period) {
        super(amount, period);
    }

    @Override
    public BigDecimal income() {
        BigDecimal totalIncome = BigDecimal.ZERO;
        BigDecimal currentAmount = getAmount();
        for (int i = 1; i <= getPeriod(); i++) {
            BigDecimal divisor = BigDecimal.valueOf(100);
            BigDecimal interestRate = BigDecimal.valueOf(i);
            BigDecimal interestFraction = interestRate.divide(divisor, 2, RoundingMode.HALF_EVEN);
            BigDecimal rawInterest = currentAmount.multiply(interestFraction);
            BigDecimal interest = rawInterest.setScale(2, RoundingMode.HALF_EVEN);

            totalIncome = totalIncome.add(interest);
            currentAmount = currentAmount.add(interest);
        }
        return totalIncome;
    }

}