Mr. brown bought a television set and paid $110 as the first installment. if he increases each payment by $20 and pays a total of 6 installments, how much will the television set have cost him?
a)$900
b)$920
c)$940
d)$960
explain

The television set would have cost Mr. Brown a total of $960, or answer D. How I determined this

So, you already know the amount of the first installment: $110. Each installment increases by $20, so for the next installment (a.k.a the 2nd installment), Mr. Brown would have to pay $130. Basically, you have to add $20 more to each previous amount. Here are all of the installment prices:

Installment 1: $110 + $20 =

Installment 2: $130. Add $20 and you get -

Installment 3: $150 + $20 =

Installment 4: $170 + $20 =

Installment 5: $190 + $20 =

Installment 6: $210.

Now that you have all of the total amounts Mr. Brown had to pay for each installment, your final step is to add all of those amounts together in order to determine your answer. How you do this:

$110 + $130 + $150 + $170 + $190 + $210 = $960, or D.
And that is how you get the answer. I hope I was able to help you! :)