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Winter Travel Using Percentages

GMAT-62YGE0

A flight to Hawaii costs on average $15\%$ less during the winter than during the summer, while a flight to North Dakota costs on average $20\%$ less. A summer flight to Hawaii costs $60\%$ more than a summer flight to North Dakota.

In terms of a summer flight to North Dakota, how much more does a winter flight to Hawaii cost than a winter flight to North Dakota?

A

$50\%$

B

$56\%$

C

$60\%$

D

$66\%$

E

$74\%$