Answer:
The answer is $320
Explanation:
This year, Arthur received $150 for his birthday, which is $10 less than half the amount he received last year.
So, half of the amount of money he received last year was $150+$10 = $160.
In order to find the money Arthur received last year, this number has to be multiplied by 2.
Arthur received $160*2 = $320 in total.