Maria and Edwin have $23.00 each to spend at a book fair, where all students receive a 25% discount. They both want to purchase a copy of the same book, which normally sells for $26.50 plus 10% sales tax. To check if she has enough to purchase the book, 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. Edwin takes 75% of the normal purchase price and then computes 110% of the reduced price. Is Maria correct? Is Edwin correct? Do they have enough money to purchase the book? Expla
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i think they are both correct, it is actually the same procedure.
First take 75% of 26.50 (same as subtracting 25%)
what do you get
@Maxipoo124 please participate
ok 75% of 26.50 gives you 19.875
now take 110%
21.86$$$ So they have enough money
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They both did the same thing in different forms.
Maria: 25% of $26.50 = 0.25 * 26.5 = 6.625
26.5 - 6.625 = 19.875
10% * 19.875 = 1.9875
19.875 + 1.9875 = 21.8625
Rounds off to $21.86
Edwin: 75% of $26.50 = 0.75 * 26.5 = 19.875
Notice that Edwin found the discounter price with a single multiplication.
110% of 19.875 = 1.1 * 19.875 = 21.8625
Rounds off to $21.86
Here, Edwin use a multiplication to add the 10% tax
The final prices are the same.