#3: It is asking you the difference in the price if you buy 5 with the bulk option or if you bought 5 individually. So option 1: if you buy 5 in-bulk, you need to pay $33.00. Option 2: if you buy 5 individually at $7.20, then you pay 5 x $7.20. Find the difference between option 1 & 2.

#4: If the original price was and a 10% discount on gives you $4,320, then your equation is . Solve for by dividing both sides by 0.9.

#5: If you are are offered a chain discount on $850, then you multiply that amount by 0.8 (20% discount) and 0.9 (10% discount) consecutively: