Get it according to the meaning of the question.
b=0.220k+b= 1.2
Solution:
k=0.05b=0.2
The relationship between y 1 and x is y 1=0.05x+0.2.
(2) According to the meaning of the question, y1+y2 = 0.05x+0.2+0.005x+0.3 = 3.8, and the solution is x=60.
The company's total sales in May was 60 units.
(3) Suppose that P sets of Type B equipment were sold in May, then 60 sets of Type C equipment (60-t-p) were sold.
Then 0.9t+1.2p+1.1(60-t-p) = 64.
The solution is p=2t-20.
∴w= 1.2t+ 1.6(2t-20)+ 1.3(60-t-2t+20)-64-3.8
That is, the functional relationship between w and t is: w = 0.5t+4.2 (14 ≤ t ≤ 24);
(4) according to the meaning of the problem, there are
t≥8
2t-20≥8
60-t-2t+20≥8
The solution is 14≤t≤24.
And ∵t is a positive integer.
∴t Up to 24
∫w is a linear function about t, and from (3), w increases with the increase of t 。
∴ When t=24 (units), W max =0.5×24+4.2= 16.2 (ten thousand yuan)
The maximum amount of the company's donation to the disaster area this time is162,000 yuan.