The sale price of the unique product is $30, contribution margin ratio 70% and the fixed expenses of the business are $300.000. Expecting $210.300 profit in the next period, made a new market research for profit planning and obtained the following results: a-) A 10% decrease in the unit sale price will cause a 15% increase in the sales quantity, b-) A 10% increase in the unit sale price will cause a 15% decrease in the sales quantity, c-) A 5% decrease in the unit sale price will cause a 10% increase in the sales quantity. As a manager of the business make your decision, is there a need to make a change in the sale price, if Yes choose the most appropriate option.