Suppose the monthly total revenue for the manufacture of golf balls is R(x) = 1.78x, where x is the number of golf balls sold each month.a. What is the slope of the graph of the total revenue function?b. What is the marginal revenue for the product?c. Interpret the marginal revenue of this product.a. What is the slope of the graph of the total revenue function?b. What is the marginal revenue (rate of change of the revenue function) for the product?$c. Choose the correct interpretation of the marginal revenue of this product.i) The revenue will decrease by $1.78 for each additional golf ball sold in a month.ii) Each month the revenue is increased by $1.78 a day.iii) The revenue will increase by $1.78 for each additional golf ball sold in a month.iv) Each month the revenue is decreased by $1.78 a day.