Take the original price, multiply it by 20% (you have to move the decimal place two to the left, so it becomes .2), then subtract the answer from the original price.
39.99*.2= $7.998
39.99-7.998= $31.99
If you wanted to, you could also round the $7.998 to $8.00. Your answer would be the same.
To find this out, use a percent proportion, use cross products, and solve the equation.

So, the percent tip is 14%.
Answer:
-7
Step-by-step explanation:
-5 + -2 = is the same as -5 - (+2), so the answer is -7
Answer:
74 books
Step-by-step explanation:
2(3b+1)
2(3(12)+1
2(36+1)
2(37)
74
Did you forget to add a picture?