Question 53992
It takes 15 black olives and 18 slices of pepperoni to make a 
large pizza. Olives cost $1.20 per can of 24 black olives. Pepperoni can 
be purchased for $3.60 per pound and you get 27 slices in a pound. How 
much more should you charge for adding black olives and 
pepperoni to a large pizza if you want to make double your cost on those two 
extras.
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Cost of 15 black olives = ?
cost/15=120/24
cost=15(120/24)=75 cents
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Cost of 18 slices of pepperoni = ?
Cost/18 = 360/27
Cost = 18(360/27)=240 cents

To double her cost she would have to charge 2(75+240)=150+480=$6.30
Cheers,
Stan H.