Is this correct??? Someone please help

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Jose predicted that he would sell 48 umbrellas. he actually sold 72 umbrellas. what are the values of a and b in the table below? round to the nearest tenth if necessary

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?