XA_1:=90; XA_2:=XA_1+(100-XA_1)/2; XA_3:=(100-XA_1)/2; XA_4:=COST(XA_2); XA_5:=COST(XA_3); SCR1:(XA_4-XA_5)/(XA_4+XA_5/2)*100;
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