At a grocery store, an uncooked beef roast is on sale for $4.99/lb. At the same store, prepared roast beef is at the deli for $2.99/100g. How many times more expensive is the deli roast compared to the uncooked roast?

For us to find out how many times more expensive is the deli roast compared to the uncooked roast we need to change the units;

cost of 100g=0.221lb is $2.99

cost of 1 lb will therefore be:

1/0.221*2.99

=$13.53/lb

therefore the number of times more expensive the deli roast is compared to uncooked roast is:

[price of 1lb roasted meat]/[price of 1 lb uncooked meat]

=13.53/4.99

=2.7 times