Question

Cost of groundnuts is directly proportional to its weight. If cost of 5 kg groundnuts is 450 then find the cost of 100 kg.

• A. 9000
• B. 5000
• C. 4000
• D. 4500

Answer 1

The correct option is A 9000

Let the cost of groundnuts be x and weight of groundnuts be y. x is directly proportional to y.
$x\alpha y$
It is given that when x = 450, thne y = 5
$x=ky$
$450=5k$
$90=k$
Now,
If $y=100,$ then $x=90\times 100=9000$