可以列一下具体计算步骤吗？

问题如下：

Paul Graham, FRM® is analyzing the sales growth of a baby product launched three years ago by a regional company. He assesses that three factors contribute heavily towards the growth and comes up with the following results:

Y = b + 1.5 X1 + 1.2X2 + 3X3

Sum of Squared Regression [SSR] = 869.76

Sum of Squared Errors [SEE] = 22.12

Determine what proportion of sales growth is explained by the regression results

选项：

A.

0.36

B.

0.98

C.

0.64

D.

0.55

解释：