Question

Sarah saves $200 the first month and every month later $50 more.

 How much will she have saved over 2 years​

Answer 1

Answer:

5700$

Step-by-step explanation:

First month amount = 200 $

Adding in every month = 50$

We can see that this is forming an arithmetic progression

a=first term = 200

D=common difference = 50

N = number of terms = 12

= a+(n-1)d

= 200+(12-1)50

=200+11(50)

200+550

=750

Sum of n terms of Ap

=n/2(2a+(n-1)d)

12/2(2×200+(12-1)50)

6(400+550)

6(950)

= 5700