At what rate percent compoud interest per annum will Rs. $640$ amount to Rs. $774.40$ in $2$ years?

Q. At what rate percent annum will $Rs.640$ amount to $Rs.774.40$ in $2$ years, interest being compounds annually?

Q. At what rate per cent per annum willl $Rs640$ amount to $Rs774.40$ in $2$ years, interest being compound annually?

Q. At what rate per annum will Rs.$640$ amount to $774.40$ in $2$ years, when interest is being compounded annually

Q. At what rate per cent per annum will Rs 640 amount to Rs 774.40 in 2 years when compounded annually?