Question 759841
p for revenue on a paperback
h for revenue on a hardcover


{{{p=4h}}}_______Revenue on a paperback is four times the revenue of a hardcover book.


If you assign:
x= how many paperbacks were sold
y = how many hardcovered were sold


Then the best you can do is make an equation for the months revenue:
{{{x*p+y*h=124300}}}
{{{x*4*h+y*h=124300}}}
or
{{{4hx+hy=124300}}}
You do not have enough information in your description to carry this any further.