Answer:
Option C. 30,000 decrease
Explanation:
At the moment Product G is covering its own variable cost which is 180,000 from its sale figure of 210,000. So there is a balance of 30,000 which product G is contributing to offset the Fixed costs of the company.
It will be inadvisable for management to discontinue the production of Product G because it appears to be making a loss. The loss is as a result of the fixed cost of 50,000 imposed (apportioned) to the product. So product G can only cover 30,000 out of this 50,000 which is resulting in the 20,000 loss.
If the product is discontinued, the 30,000 contribution of product G will be lost which will lead to a decrease in profit of that amount.