Question

Find the cost of painting a rectangular truck whose measurements are 90cm *60 cm*45 cm* at the rate of ₹200 per square metre

Answer 1

Before, finding the answer. Let's find out on how we can find the answer.

• First, we must find the Total Surface Area (TSA) of the Rectangular Truck by using the formula of :

$\boxed{ \sf 2 height(length + breadth)}$

• Now, we must convert cm to m as asked in the question.
• And last we must multiply the Laternal Surface Area with Rate.

_____________________

Given :

• Length = 90 cm
• Breadth = 60 cm
• Height = 45 cm.
• Rate = ₹200

To find :

• Total Rate

Solution :

We know that,

Lateral Surface area = 2 height (length + breadth)

LSA = (2 × 45) (90 + 60) cm

= 90 (150)

= 13500 cm²

Hence, the Total Surface Area of Rectangular Truck is 13500 cm².

Converting from cm to m:

1 m × 1m = 1 m²

100 cm × 100 cm = 1m²

10000 cm² = 1 m²

27000 ÷ 100²

= 13500 ÷ 10000

= 1.35 m²

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Rate of Rectangular Truck = Rate × Area

= 200 × 1.35

= ₹ 270.

Hence, total cost of Rectangular Truck us ₹ 270.