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

453,59 grams equals 1 lb

Uncooked beef rost is $4.99 / 453,59 grams

That is $1.10 / 100grams

The cooked one costs $2.99/100grams

That means that the deli beef roast is 2.71 times more expensive that the uncooked one (per 100 grams)

2.99/1.10=2.71