CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon


Question

A car owner buys petrol at Rs.7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year?


A
Rs. 7.98
loader
B
Rs. 8
loader
C
Rs. 8.50
loader
D
Rs. 9
loader

Solution

The correct option is A Rs. $$7.98$$
Total quantity of petrol consumed in 3 years = $$\begin{pmatrix}\dfrac{400}{7.50}+\dfrac{4000}{8}+\dfrac{4000}{8.50}\end{pmatrix}$$ litres
= $$4000 \begin{pmatrix}\dfrac{2}{15}+\dfrac{1}{8}\dfrac{2}{17}\end{pmatrix}$$ litres
= $$\begin{pmatrix}\dfrac{76700}{51}\end{pmatrix}$$ litres
Total amount spent = Rs. (3 x 4000) = Rs. 12000.
$$\therefore$$ Average cost = Rs. $$\begin{pmatrix}\dfrac{12000\times 51}{76700}\end{pmatrix}$$ = Rs. $$\dfrac{6120}{767}$$ = Rs. $$7.98$$

Mathematics

Suggest Corrections
thumbs-up
 
0


similar_icon
Similar questions
View More


similar_icon
People also searched for
View More



footer-image