I need urgent help ill give brainliest

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost