সব প্রশ্নে ফিরে যান
Math
What is the rate of simple interest for the first 4 years if the sum of TK. 360 becomes TK. 540 in 9 years and the rate of interest for the last 5 years is 6% ?
A) 4%
B) 5%
সঠিক উত্তর
C) 3%
D) 6%