Would you please help? A math problem in the senior high school entrance examination, please come in ... I'm in grade two now, and my teacher gave us special training in summer vacation ... thank you.

Let the proportion of raw material A be x, and then b be 1-x:

15 *( 1+20%)X+ 10 *( 1+ 10%)( 1-X)=[ 15X+ 10( 1-X)]*( 1+ 12%)

18X+ 1 1- 1 1X =( 15X+ 10- 10X)* 1. 12

1.4X=0.2

X= 1/7

1-X=6/7

15 * (17)+10 * (6/7) = 75/7 yuan.

(75/7) * (70%) = 7.5 yuan

12 * (1+20%) =14.4 yuan.

7.5÷14.4 = 25/48 = 52.1%(75/7) * (1+12%) =12 yuan.

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