function depositProfit(deposit, rate, threshold) {
    
    let years = 0
    let capital = deposit
    const applyRate = (capital)=>{
        if (capital < threshold){
            capital = (capital / 100) * (100 + rate)
            years++
            applyRate(capital)
        }
        return    
    }
    applyRate(capital)
    return years    
}



/**
* Test Suite 
*/
describe('depositProfit()', () => {
    it('returns number of years it will take to hit threshold based off of deposit & rate', () => {
        // arrange
        const deposit = 100;
        const rate = 20;
        const threshold = 170;
        
        // act
        const result = depositProfit(deposit, rate, threshold)

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toBe(3);
    });
});