题目是这样的： calculating the price of a T-bill futures contract
A 60 day T-bill is quoted at 6%, and a 150 day bill is priced at 6.5%.Calculate the on arbitage price of a 60 day future on a 90 day T bill.

题目的解答中说 alternative way 是 FP=0.9729/0.9900=0.9827
我不是很理解为什么可以直接这样做， 有人可以帮我解答吗？