Devesh Lall
Last Activity: 13 Years ago
SOLUTION FOR QUESTION NO.-3
Since amt borrowed by a man earlier = Rs 1000
" total interst offerd to him in 12 installments = Rs 140
Now, let total overall amt be with the man be Sn =Rs (1000+140)
= Rs 1140
" " his 1st installment be a
" " n be the no of installments = 12
" " d " =-10
" using the formula :- Sn=n/2[2a+(n-1)d]
1140=12/2[2a+11x-10]
1140=6[2a-110]
1140=12a-660
12a=1140+660
12a=1800
a= Rs 150
Therefore his required 1st installment = Rs 150