An author is having a book signing at a store. she agrees to give 15% of the money she earns to a local school library and 10% of the money she earns to her manager. if she earns $400.00, how much money does she take home?

Hey there!

To solve this problem, all you need to do is calculate what 15% + 10%, or 25%, of $400.00 is. You can convert percentages into decimals by moving the decimal point as such: 15% becomes 0.15, and vice versa. 

To solve for how much 25% of 400 is, you need to multiply:

$400.00 * 0.25 = $100.00

So, since she's giving $100.00 of the money to the local library and her manager, she takes home the rest. 

$400.00 – $100.00 = $300.00

Hope this helped you out! :-)