Park spent one third of his money on a sweater. he spent three fifths of the remainder on a pair of jeans. he spent three fifths of the remainder on a pair of jeans. if he has $36 left, how much did the sweater cost?

I think it could be 2700$, but I am not sure. 

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.