Question 1196691
In general, whatever values given
P, normal price
D, how much taken of from the normal price; or the price reduction
P-D, the reduced price
N, total number of items sold
R, the amount of sales (dollars)
x, how many were sold at the normal price of P


{{{highlight_green(Px+(P-D)(N-x)=R)}}}

{{{Px+PN-DN-Px+Dx=R}}}

{{{(Px-Px)+PN-DN+Dx=R}}}

{{{Dx=R-PN+DN}}}

{{{highlight(x=(R-PN+DN)/D)}}}----------The quantity sold at the normal price