Answer:
$16
Step-by-step explanation
*If you move the decimal place once to the left, you get 2. So, 10% of 20 = 2.
*2 divided by 2 = 1, so 5% of 20 = 1.
*1 + 2 = 3, so 15% = 3.
* 3 + 1 = 4, so 20% = 4 ( and 15% + 5% = 20%)
* 20 - 4 = 16, so the most expensive item you can order is $16.