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040 Deposit Profit

/**
 * 
 * Ashish Patel
 * e: ashishsushilPatel@gmail.com
 * w: https://ashish.me
 *
 */

/* 
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.
*/

function depositProfit(deposit, rate, threshold) {
  let amount = deposit
  let year = 0
  while(amount < threshold){
    amount += amount * 20/100
    year += 1
  }
  return year
}

test('deposit Profit', () => {
  expect(depositProfit(100,20,170)).toEqual(3)
});

Created 2019-12-14T23:11:16+05:18 · Edit