Christopher bought a new watch at the store when they were having a 2 0 % 20%20, percent off sale. if the regular price of the watch was $ 4 8 $48dollar sign, 48, how much did christopher pay with the discount?

For this case we can make the following rule of three:
 $ 48 > 100%
 x > 20%
 Clearing x we have:
 x = (20/100) * (48)
 x = 9.6 $
 Then, the price you paid for the watch is:
 48 - 9.6 = 38.4 $
 
 Christopher did pay 38.4 $ with the discount

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