HELP!HELP!Maths questions!!!!!

1,Tim paid $800 for a ticket to a concert at a student discount of 20%.
a) What was the marked price of Jim's ticket?
b) Kerry also bought a ticket to the concert with the same marked price and student discount.However,Kerry got an extra 10% off the selling price because she belonged to a fan club.At what overall discount per cent did Kerry buy her ticket?
2,Last year,Mrs Lee's weight was 3 times of her daughter's weight.This year,her son's weight increases by 10% while her weight decreases by 10%.Mrs Lee is now 32kg heavier than her son.Find Mrs Lee's weight last year.
3,Sam buys 500 TV game sets at a cost of $110000.If each game set is sold at a discount of 20%,he will make a profit of 20%.Find
a)his total profit,
b)the selling price of each game set,
c)the marked price of each game set.
4,Alex bought a teddy bear and sold it at 20% profit to Kim.Kim bought a suit costing $100 and dressed the teddy bear up in the suit.Kim then sold the teddy bear in the suit to Karen for $442.Kim made a profit of 30$.What was the price that Alex paid for the teddy bear?