JAMB - Mathematics (1986 - No. 36)

An open rectangular box externally measures 4m x 3m x 4m. Find the total cost of painting the box externally if it costs N2.00 to paint one square meter
N96.00
N112.00
N136.00
N160.00

Explanation

Total surface area(s) = 2(4 x 3) + 2(4 x 4)

= 2(12) + 2(16)

= 24 + 32

= 56cm2

1m2 costs N2.00

∴ 56m∴ will cost 56 x N2.00

= N112.00

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