Since we are trying to figure out how much money is earned in 4 hours in tips, and it says that <em>62 pizzas are delivered in 4 hours</em> we just need to <em>multiply 62 (pizza) by 0.20 (1 tip).</em>
This would be true because it shows that p equals either a or b and it also shows that p equals a which is true because it is one of the independent choices.