Which cost more 17 candy bars that cost 79 cents each or 21 candy bars that cost 65 cents each how much more

To determine which option costs more, we need to find the total cost for each option.

For 17 candy bars costing 79 cents each:
Total cost = 17 * $0.79 = $<<17*0.79=13.43>>13.43

For 21 candy bars costing 65 cents each:
Total cost = 21 * $0.65 = $<<21*0.65=13.65>>13.65

Therefore, the second option with 21 candy bars costing 65 cents each costs $13.65 - $13.43 = $0.22 more.