Hello!
First of all, excluding leap day and all that, there are about 52 weeks in a year. We just multiply.
12.55(52)=652.6
Therefore, you spend $652.6 annually.
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It seems that now we spend $10 a week, and save 2.55 weekly. First of all, we multiply our ten.
10(52)=520
We also multiply our savings.
2.55(52)=132.6
Therefore, you spend $520 annually and save $132.6.
I hope this helps!