The cost of a packet of chips is ₹5. The cost of 6 such packets is ₹30.

Q. If the cost of one packet of chips is 30 rupees, then the cost of 8 such packets is

Q. Packets of 12 pencils each, cost Rs 499.20. Find the cost of 65 packets of 10 pencils each.

Q. What is the cost of a packet of bread if $6$ packets of bread and $3$ packets of butter together cost Rs $90$ and a packet of butter costs thrice that of a packet of bread?

Q. If the cost of $65$ tea-packets of the same size is Rs.$2600$, what is the cost of $75$ such packets?

Q. The cost of a packet of balloons is $\$21$. Estimate the total cost of $5$ such packets. (Round off to the nearest ten.)