42、某个工厂investment and gain: investment--$100,000(initial) 每一年都有赢利和亏损: # i! e- l5 o/ m! c7 P7 O( I! v; m
question: 1> how much is left at the end of the second year? 100,000*(1+2、1%)(1-4%)=970,000(忘了答案了,不过不难) n! D3 N* t) {5 A: G. ~# H + D; D) y0 R7 h. p; ^; O' k
2>第n 年1/3 gain is completed by one quarter of the year, 问 the average of the gain of the year for every quarter,即这一年平均每个季度的增长率,这一年总增长率22。9%,年初有d dollars、 ' i, ~ p( {5 s0 [
My key 0、07 dollar (记不太清了) 9 m. t& m3 z3 b6 @# o" U