M/7.5=6/6.25
M=7.2
(2) If the law of corn price growth remains unchanged in June and the following months, and the monthly pork price continues to decline, please predict whether to take preventive measures in July according to the percentage of pork price decline in May compared with last month.
The price of corn changes according to the law of y=0. 1x+0.5 (Y is the price and x is the month), and the price of pork drops (6.25-6)/6.25=0.04, so the price of pork in June is 6*( 1-0.04)=5.76.
June
w = 5.76/(0. 1 * 6+0.5)= 288/55 & lt； six
July
w = 5.76 *( 1-0.04)=/(0. 1 * 7+0.5)= 4.608 & lt； 6, so you need.