A student spends 12% of his or her money on a book. After buying the book, the student has $120.12 left. How much money did the student have before buying the book?

HElP ASAP

(tell me how to do the work also please

$136.50

Step-by-step explanation:

100 - 12 = 88% (How much percentage of money the student left)

88% = 120.12

1% = 120.12 ÷ 88 = 1.365

Before buying the book, the student had 100%

100% = 1.365 x 100 = 136.50

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

nlgqer

step-by-step