book Maths Puzzle Numerical Ability

The problem states: A computer is on sale for $1600, which is a 20% discount off the regular price, what is the regular price. I need to know the equation for types of problems l

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Im trying to find the measure of the fifth convex pentagon. the other measures are 100,130,152,and 90.
Aslo:
I m trying to find the mesaure of the largest angle in a triangle wi What expression raised to the fourth power is 81x^12y^8z^16?