



 
Hi Saira, I think of this as viewing a process from the end, looking back at the beginning, the beginning being the starting price and the end the sale price. If you knew the starting price you could go forward, by that I mean
Let's say that algebraically. Let the regular price be $x$ dollars and since $12\% = \frac{12}{100} = 0.12$ then the "forward equation" is \[x  0.12 \times x = 55.50 \mbox{ dollars.}\] This simplifies to \[(1  0.12)x = 55.50\] or \[0.88 x = 55.50.\] Solve for $x.$ Penny  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 