college albegra
posted by algebrajunkie on .
Brandon has 3 inventions, one saves 30 percent on fuel; a second saves 45% a third saves 25%. If he uses all three inventions at once, what percent can he save on fuel?
do I add all of the percentages together and divide by 3?
=1/3 or 3%? or is it 100%?

If he uses all 3 inventions he spends
(10.30)(10.45)(10.25)100%=28.875% of fuel. Therefore, 10028.875=71.125% he can save. 
thank you so much!