Question

Find the simple interest on Rs. 5a²b² for 4ab years at 7b% per annum

Answer 1

Simple interest = `("Principal" xx "years" xx "rate of interest")/100`

= `(5"a"^2"b"^2 xx 4"ab" xx 7"b")/100`

= `((5 xx 4 xx 7)("a"^2 xx "b"^2 xx "a" xx "b" xx "b"))/100`

= `140/100  ("a"^2"b"^4)`

= `14/10  "a"^3"b"^4`

Simple interest = `7/5  "a"^3"b"^4`