Answer:
38
Explanation:
A simple way to find the answer is to first find 10% of 40 by moving the decimal one place to the left.
Then you have 4, multiply that by 9. Because 4 is 10% so 4 times 9 would give you 90%
Now you have 36, to find the last 5% just half 10%, so 2, and add that on
Your answer is 38.