Valleyfair; and a question

Vanessa took the day off of work and she and I are going to Valleyfair to celebrate my b-day today. It looks like the start of another nice day.

I have a Noodles gift card that I used almost completely up last night. The card has a credit of $0.19 and weighs approximately 4 grams. Is it worth it to continue to carry in my purse? For how long (taking the weight and value into consideration)? Could this be a trick math question for a high schooler... If a gift card weighing 4 g holds a value of 19 cents, how much did the card weigh at its initial $10 value? (answer, if this weren't a trick question, would be 210.53 g)