the sum of money will be double itself in 20 years and simple interest find rate of interest ?
"t = 20 years p = principle amount = x a = total amount = 2 x si = simple interest = a - p = 2 x - x = x r = 100 si / pt = 100 x / 20 x = 5 % answer is b"
multiply(divide(20, const_100), const_100)