Rakesh rented out an amount to Samarth for 6 years at simple interest rate. At the end of the 6th year, Samarth paid 8/7 of the amount to Rakesh to clear out the amount. The rate of simple interest per annum was :
A2 7/21 %
B2 3/20 %
C2 1/12%
D2 8/21%
