ron is given a problem below to solve. His work is shown in the box. His teacher told him the answers were supposed to come out as a whole number cut, though. Explain my mistake Rod mad and why he should not have done it

Abari owns 100 shares of stock a and 45 shares of stock b. for the past month, his stocks have been fluctuating inversely. stock a decreased by m cents per share and stock b increased by n cents per share. which equation can be used to find the total change in value of jabari's shares per month?