110 % of something is 110/100 = 1.1 times that something
so 110% = 200 * 1.1 = 220 answer
The sum is 160/(1-r)=1280 where r is the common ratio,
1/(1-r)=1280/160=8
Inverting we get 1-r=1/8, r=7/8.
I can help with the formula just do the math on a calculator you multiply length x width x height
