a money lender lent rs . 1000 at 3 % per year and rs . 1400 at 5 % per year . the amount should be returned to him when the total interest comes to rs . 390 . find the number of years .
( 1000 xtx 3 / 100 ) + ( 1400 xtx 5 / 100 ) = 390 â † ’ t = 3.9 answer d
divide(390, add(divide(multiply(3, 1000), const_100), divide(multiply(1400, 5), const_100)))