1. If the sales tax rate is 6%, find the sales tax on a microwave oven priced at $188.
2. A stereo system has a purchase price of $426. What is the total price if the sales tax rate is 8%?
3. The sales tax on the purchase of a $6800 used car is $374. Find the sales tax rate.
4. The sales tax on a one-half-carat diamond ring is $76.
a. Find the purchase price of the ring (before tax) if the sales tax rate is 9.5%.
b. Find the total price of the ring.

5. The purchase price of a personal computer is $1890. If the sales tax rate is 8%, what is the sales tax and the total price?