Question

solving first month 200, second month is 250 and third month is 300 this is an a.p​

Answer 1

a.p=200,250,300…............

t1=200,t2=250....

common difference (d)=t2-t1

=250-200

=50

Sn=n÷2(2a+(n-1)d)

S17 =

$17 \div 2 \times 2 \times 200 + 16 \times 50$

=8.5×400+800

=3400+800

=4200