A sum of money lent out at simple interest amounts to Rs720 after 2 years and toRs1020 after a further period of 5 years. What is the sum?
Simple interest for2 years = Rs.720.
Simple interest for 7 years=Rs.1020
Simple interest for5 years=Rs.1020–Rs.720=Rs.300.
Simple interest for 2years =(3005)×2=Rs.120
Hence, the sum is Rs.600.
A sum of money at simple interest amounts to Rs. 1000 in 4 years and to Rs. 1050 in 5 years. What is the sum?