Verified Answer :

we just need to multiply the amount of pounds and the cost of each one of them, that is:
spent = 4.5*1.68
= 7.56
so she spent $7.56

Solutions 

Given -- 

1 pound = $ 1.68 

Calculations 

To find how much 4 pounds cost multiply by 4. 

1.68 x 4 = 6.72 

To find .5 divide 1.68 by 2 and add it to 6.72. 

1.68 ÷ 2 = 0.84 

6.72 + 0.84 = 7.56 

She spent $ 7.56 

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