Jen and Barry's ice cream shop charges $1.4 for a cone. Variable expenses are $0.25 per cone, and fixed costs total $2,400 per month. A Valentine's Day promotion is being planned for the second week of February. During this week, a person buying a cone at the regular price would receive a free cone for a friend. It is estimated that 800 additional cones would be sold and that 1,000 cones would be given away. Advertising costs for the promotion would be $135. Required: a. Calculate the effect of the promotion on operating income for the second week of February. b. Do you think the promotion should occur? Calculate the effect of the promotion on operating income for the second week of February. Note: Do not round intermediate calculation and round your final answer to 2 decimal places. Do you think the promotion should occur