Question

The following table shows the bonus earned by Samuel for selling different numbers of shirts:

Samuel's Bonus
Number of Shirts Sold Bonus Earned
9 24
12 32
15 40
18 48
21 ?

Answer 1

The answer is 56.
If you look, the second number column increases by eight each time. So take the last number, forty eight, and add eight to it.
Hope that helps!