DepositProfit.java

/*

You have deposited a specific amount of dollars into your bank account. Each year your balance increases at the same growth rate. Find out how long it would take for your balance to pass a specific threshold with the assumption that you don't make any additional deposits.

Example

For deposit = 100, rate = 20 and threshold = 170, the output should be
depositProfit(deposit, rate, threshold) = 3.

Each year the amount of money on your account increases by 20%. It means that throughout the years your balance would be:

year 0: 100;
year 1: 120;
year 2: 144;
year 3: 172,8.
Thus, it will take 3 years for your balance to pass the threshold, which is the answer.

*/

int depositProfit(int deposit, int rate, int threshold) {
    int res=0;
    double d=deposit;
    double interest;
    while(d<threshold){
        interest=(d/100.0)*rate;
        d=d+interest;
        res++;
    }
    return res;
}