Answer:
The new amount after a 30% increase is $9.10.
To find the new amount after a 30% increase, we need to first calculate the total amount of the increase by multiplying the original amount by the percent of increase: $7 * 0.30 = $2.10.
Then, we need to add the total increase to the original amount to find the new amount: $7 + $2.10 = $9.10.
Therefore, the new amount after a 30% increase is $9.10.