Question

21 shirts = $147 and 22 shirts =$154 and 23 shirts = $161 then how much does 30 shirts cost and how much does 9 shirts cost to

Answer 1

$210 and $63

Explanation:

21 shirts = $147 and 22 shirts =$154 and 23 shirts = $161

We can see from this sequence that the price goes up by $7 when another shirt is added.

So the price of one shirt = $7

Then the price of 30 shirts:

30×$7 = $210

and

9 shirts:

9×$7 = $63