Grady makes $25 a week taking care of some chores around the house. he also makes $250 a week for 12 weeks during the summer.

1. grady spends an average of $40 on gas and eating out. how much of his summer income does grady need to use to supplement his income during the school year?

2. grady would like to spend $500 on a guitar. will he have enough money to do that and supplement his income if he saves $100 a week of his summer money?

3. what if the guitar costs $1000?