You just priced what it would cost to buy vinyl floor tiles at the local tile store. they quoted you $3.29 per tile. when you went home you found the same exact title for sale at an online outlet for $2.89 per tile. as a percentage, how much more expensive is the tile store's quote?
how would i do this and set it up to figure out the answer.

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297

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?

Write a similarity statement for the similar triangles. afgh ~ a