<human>:  Gretchen's local ice cream shop offers 100 different flavors. She was able to try a 1/4 of the flavors 2 years ago and double that amount last year. How many more flavors will she need to try this year to have tried all 100 flavors?
<bot>: How many flavors did Gretchen try 2 years ago? ** The shop offers 100 flavors and she tried 1/4 of the flavors so she had 100*.25 = <<100*.25=25>>25 flavors 2 years ago
How many flavors did Gretchen try last year? ** Last year she ate double the amount from the previous year so she had 25*2 = <<25*2=50>>50 flavors
How many flavors has Gretchen tried in total? ** 2 years ago she ate 25 flavors and last year she had 50 flavors so she has had 25+50 = <<25+50=75>>75 flavors
How many more flavors will Gretchen need to try this year to have tried all 100 flavors? ** The shop offers 100 flavors and she has had 75 flavors so she still needs to try 100-75 = <<100-75=25>>25 flavors
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