Sian bought tv in january sales which had been reduced by 20 per cent. if she paid £290 for it, what was the original price?

Siam bought tv in January sales which had been reduced by 20 per cent. If she paid 290 for it what was the original price? $362.50

X=original price.
20%=20/100=0.2
We can suggest the next equation to solve this problem:

x-0.2x=290

We solve this equation:
x-0.2x=290
0.8x=290
x=290/0.8
x=362.5

the original price was £362.5.