Please help!! I seriously don’t understand what this is asking me to do.

Write the following as a base and exponent

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?