book Maths Puzzle Numerical Ability

i need help with multiplying negative fractions!!! i get so confused! can u help me?

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Marshall has 36 feet of fencing to use to build a pen. He plans to use the barn for on side of the pen. What is the largest area he can create for the pen using the 36 feet of fencing and the side of the barn? How do you find the percentage decrease from 67883-59921?