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A shop sells soccer balls at a Selling Price of $100 per ball. TheCost per ball

ID: 2574805 • Letter: A

Question

A shop sells soccer balls at a Selling Price of $100 per ball. TheCost per ball i 60% of the Sales Price per ball. The shop is closed during weekends. For a week the sales were: Monday 3 balls, Tuesday 2 balls, Wednesday 4 balls, Thursday 1 ball; Friday 5 balls. Show the following calculation in full:

The week's total income (total sales amount) is invested at a bank at an interest rate of 5% simple interest for a period of 3 years. Calculate the total amount available at the end of the 3 years.

Explanation / Answer

Weekday No. of units sold Sale price per ball Total surplus amount

Monday 3 $ 100 $ 300

Tuesday 2 $ 100 $ 200

Wednesday 4 $ 100 $ 400

Thursday 1 $ 100 $ 100

Friday 5 $ 100 $ 500

---------------- ---------------- ----------------

Week Total 15 $ 100 $ 1500

========= ========== =========

Calculation of Weekly interest for 3 years Simple interest

= ( 3 years X Annual interest ) / 156 weeks

= ( 3 years x 5 ) / 156 weeks

= 0.096154

Calculation of Time interval

= No. of Weeks X [ (No. of Weeks + 1 ) / 2 ]

= 156 weeks X [ ( 156 weeks + 1 ) / 2 ]

= 156 X [ 78.50 ]

= 12,246

Weekly deposit amount = $ 1500

Amount = Principal + ( Principal X Time interval X Weekly interest for 3 years )

Amount = ( $ 1500 x 156 ) + ( $ 1500 X 12,246 X 0.096154 )

Amount = $ 234,000 + ( $ 17,662.53 )

Amount = $ 251,662.53

An amount of $ 251,662.53 will be available at bank at the end of 3 years.

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