$A$ year ago,the cost of Maruti and Figo were in the ratio of $3:4$. The ratio of present and past year costs of Maruti and Figo are $5:4$ and $3:2$,respectively. If the sum of their present costs is $7.8$ lacs,find the cost (in lacs) of Figo a year ago.

The salaries of $A, B, C$ are in the ratio $2: 3: 5$. If increments of $15\%, 10\%,$ and $20\%$ are allowed respectively in their salaries,then what will be the new ratio of their salaries?

What should be subtracted from $15, 28, 20,$ and $38$ so that the remaining numbers are in proportion?

The fourth proportional to $5, 8, 15$ is

Which of the following represents a correct proportion?

The electricity bill of a certain establishment is partly fixed and partly varies as the number of units of electricity consumed. When in a certain month $540$ units are consumed,the bill is $Rs. 1800$. In another month $620$ units are consumed and the bill is $Rs. 2040$. In yet another month $500$ units are consumed. The bill (in $Rs.$) for that month would be: