Hi,
Answer: $2.10
My work: You can easily achieve this by (caculator) taking 30.10 and multiplying it by the percent of 7; in which you get the answer 2.10. This can be easily achieved in 2 steps.
My Numerical Work:
Multiply:
1. 30.10 * 7%
2. 2.10
I Hope I ahelped!