He is $45 short because 100 x .45 = <<100*.45=45>>45

He earned $55 off goldfish because 100 - 45 = <<100-45=55>>55

He makes $.5 profit per goldfish because .75 - .25 = <<.75-.25=.5>>.5

He sold 110 goldfish that week because 55 / .5 = <<55/.5=110>>110

# Answer

110
<|im_start|>system
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<|im_start|>user
The pet store can buy a goldfish for $.25 and sell it for $.75. The owner plans to use the profits from goldfish sales to buy a new tank, which costs $100. After one week, he is 45% short of the price. How many goldfish did he sell that week?
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<|im_start|>assistant

user
110
The pet store can buy a goldfish for $.25 and sell it for $.75. The owner plans to use the profits from goldfish sales to buy a new tank, which costs $100. After one week, he is 45% short of the price. How many goldfish did he sell that week?
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