Ms.Gartland bought x number of shirts for the new members of her chorus.The cost for x number of shirts,including $3.99 shipping,was $ 77.49.Each shirt cost $12.25.There was no sales tax on this purchase.Which equation could be used to find x? A 3.99(x+12.25)=77.49 B 3.99x+12.25=77.49 C 12.25(x+3.99)=77.49 D12.25x+3.99=77.49