Question

A sum of rs. 6240 is paid off in 30 instalments such that each instalment is rs. 10 more than the proceeding installment. The value of the 1st instalment is

Answer 1

HERE IS YOUR ANSWER MATE

6240=30x+29/2(10+290)

1st. payment=x

2nd. payment=x+10

3rd. payment=x+20

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30th paynebt=x+290

Payment sum=30x+29/2(10+290)

The 30x is the total of the base payments.

The 29/2(10+290) is the sum of the increasing additional payments for the last 29 payments.

6240=30x+14.5*300

6240=30x+4350

30x=6240-4350

30x=1890

x=1890/30

x=$63 is the amount of the first payment.

Proof:

30(63+63+290)/2

30*416/2

15*416=6,240