Answer:
D. p + 0.07p
Explanation:
Answer choice D is correct because if we were to plug in a variable (e.g. 1 and 2), we would get the same amount when using 1.07p. All the other answer choices either work for only one value or don't work at all.
For example,
1 + 0.07 = 1.07
1.07 = 1.07
2 + 0.14 = 2.14
2.14 = 2.14