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

The correct option is C 240 rupees
Cost of one packet of chips is 30 rupees.
We need to find the cost of 8 such packets.
That is, we need to find the value of $8\times 30$.
To find the value of $8\times 30$, we find $8\times 3$ first and then write one zero on the right of the result that is obtained.
We know that $8\times 3=24$.
So, $8\times 30=240$.
Therefore, the cost of 8 packets of chips is rupees 240.