Last year, Sandro bought a book for $20. This year the same book cost $25. What was the percent of change in the cost of the book?

sin3a=12/15

step-by-step explanation:

since one side was multiplied by 3 the other side must also be multiplied by 3.

5   1/4   miles per hour

step-by-step explanation:

15   3/4 / 3 = 5   1/4

you can use a^2+ b^2=c^2

$320 to $405

step by step explanation:

in one day he earns between $64 and $81

therefore if he works for 5 days, he will earn between 64 x 5 to 81 x 5

= $320 to $405