A crystal pendant is in the shape of a square pyramid. If the sides of the base of the pyramid are 6 millimeters (mm) long, and the height of each triangular face is 9 millimeters, what is the surface area of the pyramid in square mm?

2 ways
1. math
2. math+logic (easier)

1.
percent means parts out of 100
x%=x/100

816/850=x/100
times both sides by 8500
8160=85x
divide both sides by 85
96=x
answer is 96%

2. easier
816/850=0.96/1
multily it by 100/100 to make it over 100 and into percent
96/100=96%

answer is 96%