Answer: $180 for 4 shirts and 360 for 8 shirts (this includes the 10% discount for both answers)
Step-by-step explanation: First, we have to multiply 50 by 4, since each shirt is $50 and there are 4 shirts to purchase. The answer is $200, but you have a 10% discount to consider. 10% of 200 is 20, so subtract $20 from 200, and you get $180 for 4 shirts. To find out the amount of money it costs to pay for 8 shirts, you can simply add 180 and 180 together and it'll give you 360. This way, the 10% discount will not be left out.
Let me know if this is right! :)