The way it is written, none of them.

The "a"s cancel out.
Answer
50 dollars
Explanation
Answer:
27 years
Step-by-step explanation:
21 × 2 = 42
42 - 15 = 27
Answer:
3680
Step-by-step explanation:
So, we would subtract. But, first we have to find the percent. But, we all use calculators so, it is 920. Saves us a lot of time.
4600 - 920 = 3680
Therefore your answer is 3680
Hope this helps!