Maria takes 25% of $26.50 and subtracts that amount from the normal price. she takes 10% of the discounted selling price and adds it back to find the purchase amount

Sorry I don't know about edwin's but I do know maria's

Step-by-step explanation:

What Maria did:

1.25% of $26.50 = 6.625 or 0.25 x 26.50 = 6.625

2. 6.625 - 26.50 = 19.875 or 19.88

3. 10% x 19.88 = 1.988 or 2.00

4. 2.00 + 19.88 = 21.88

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^