reema took a loan of rs 1200 with simple interest for as many years as the rate of interest . if she paid rs . 432 as interest at the end of the loan period , what was the rate of interest .
"explanation : let rate = r % then time = r years . = > 1200 ∗ r ∗ r / 100 = 432 = > r 2 = 36 = > r = 6 % option b"
sqrt(divide(432, divide(1200, const_100)))