from 1960 to 1970, the consumer price index (CPI) increased from 29.6 to 38.8 if a dozen tangerines cost 0.31 in 1960 and the price of tangerines increase at the same rate as the CPI from 1960 to 1970, approximately how much did a dozen tangerines cost in 1970

Your subscription to investing wisely weekly is about to expire. you plan to subscribe to the magazine for the rest of your life, and you can renew it by paying $85 annually, beginning immediately, or you can get a lifetime subscription for $620, also payable immediately. assuming that you can earn 6.0% on your funds and that the annual renewal rate will remain constant, how many years must you live to make the lifetime subscription the better buy?