A new car is purchased for $49,000 and over time its value depreciates by one half every 7 years. How long, to the nearest tenth of a year, would it take for the value of
the car to be $32, 200?

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)