A man bought a car for $8,200 and sold it for 80% of the price two years later. How much did he lose?

Find the number of liters in 12.8 gal of gasoline. round to the nearest hundredths

I’m still confused on how to work the percentages

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.