In order to get the answer to this question, we first have to subtract 350 and 70 in order to get the unit change of the two numbers. So after subtracting 350 and 70, we will get an answer of 280. After that, we simply divide 280 with 350 in order to get the percentage of change. After division, we will get an answer of 0.8. In order to get the percentage form of that value, we will just multiply 0.8 with 100 to get 80 or 80%