The Market Research Department at a Manufacturing Plant Determines That

The market research department at a manufacturing plant determines that 30% of the people who purchase the plant's product during any month will not purchase it the next month. On the other hand, 40% of the people who do not purchase the product during any month will purchase it the next month. In a population of 1000 people, 100 people purchased the product this month. How many will purchase the product next month?

A) 510 people
B) 570 people
C) 430 people
D) 400 people
E) 370 people