Rob is balancing his checkbook. his beginning checking account balance was $1. he deposited a check for $77 from his part-time job and $37 in cash that he received in tips into the account. using his debit card, he purchased $25 worth of gas. on a night out with friends, rob used his debit card to spend $8 on a movie ticket and $12 on snacks. rob's mother told him that he needs to put money into a savings account. so rob withdrew the tip money from his checking account and put it into a new savings account. what is rob's checking account balance?