Question

1. A rectangular piece of plastic sheet measures 1 m by 70 cm. Find its cost at the rate of 80 per square
es.
metre.
​

Answer 1

Given:

• There's a rectangular plastic sheet.
• The dimensions of the field are 1m × 70cm.
• The rate of plastic sheet is Rs 80/m².

To Find:

• The cost of the plastic sheet.

Concept Used:

• We will first find the area.
• Secondly we will multiply the area by Rate to find out the total cost .

Answer:

Here first we need to convert the quantities in same units ,

• Length = 1m .
• Breadth = 70cm = 0.7m (1m = 100cm).

Now , area of rectangle is given by ;

$\large{\underline{\boxed{\red{\sf{\hookrightarrow Area_{rectangle}=length\times breadth}}}}}$

Hence area = 1m × 0.7m = 7m²/10.

Rate of plastic sheet = Rs 80/m².

Hence , Cost = Area × Rate.

=> Cost = 7m²/10 × Rs 80/m².

Therefore cost = Rs 56.

Hence the required answer is Rs 56.