How many weeks will it take Blakey saving her allowance to buy a CD player cost 123.75 if she earns 8.25 per week?

How many weeks will it take Blakey saving her allowance to buy a CD player cost 123.75 if she earns 8.25 per week?
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Answer :

NW = CDPC / E* = $123.75 / $8.25/week = 15 weeks
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