Answer:
a & c
Step-by-step explanation:
88.3 is what % of 21
21 × a percent = 88.3
Divide 21 on either sides to find the percentage.

=

% = 4.204
88.3 is 4.205% of 21
So it is really easy to solve firstly we can see how much does the first 10 boxes make which makes around 55$ obviously. Secondly 45$ for the next 10 boxes.
So for now we can simply calculate that we have spent around 100$ which means 20 boxes. The remaining money left is 77$ so we can buy 77/3.5 = 22 only 22 boxes with that money. Hence a total of 42 boxes.
The answer is B(2,22).
Since 1 shirt costs 11 dollars, 2 shirts will cost 22 dollars. Hope this helps!