The second pair of shoes was 50/100 * 22 = $<<50/100*22=11>>11 more expensive.

That means that the second pair's price was 22 + 11 = $<<22+11=33>>33.

So for both pairs of shoes, Nina paid 33 + 22 = $<<33+22=55>>55.

# Answer

55
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Nina has two pairs of shoes. She bought one of them for $22, and the second one was 50% more expensive. How much did Nina pay for both pairs of shoes?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
55
Nina has two pairs of shoes. She bought one of them for $22, and the second one was 50% more expensive. How much did Nina pay for both pairs of shoes?
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