7 x 10 to the power of -4
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1. Find the difference between the two years (+128) 2. Divide the difference by your first year's number (128/36 = 3.55) 3. You have a YOY increase of 355%!
The quickest way would be to actually measure it!Another way is to find how high/wide the ball is. This has to be done very accurately. Yoy could use parallel wooden boards (be careful not to squash the ball!The multiply the width/height of the ball by 3.14159265 (Pi).The formula is Pi x d (diameter) = circumference. A ball that is 30 cms in diameter will have a circumference of 94.248 cms.