ina has been reading about international trade and absolute and comparative advantages. she and her friend, gina, have to create a powerpoint presentation for their business class about international trade. ina can create animated powerpoint presentations that clearly and precisely convey the message they need to make, but in a light and entertaining fashion. however, she is not good at public speaking. gina is an excellent public speaker and can create equally excellent powerpoints. both students have homework for other classes to do, so they agree to divide the work: ina will create the powerpoint and gina will do the verbal and written part of the presentation. what advantage does gina have over ina in making presentations?