If the phone costs $ 124 ,and first was marked up by 20 % it means that it was for sale for
124+(124*20)100=124+24.80= $148.80
if the seller decreased the mark up to 15% then the phone costs now
124+(124*15)/100=124+18.60= $ 142.60
4*200+4*70+4*5, or you can just use a calculator.
Twenty minutes to work over the most would agree that your replying the i
Answer: This equation is a tautology (Something which is always true)
