Similar to Missing Dollar Riddle...?

FOUR people went to dinner, person A, person B, person C, person D. They got a bill of $250. Person A, B, and C paid $100 each. So they have $50 change. A gets $10, B gets $10, C gets $10, D gets $20. So A, B, and C paid $90, right? $90 x 3 equals $270. Add in $20 from D and it equals to $290. Where's the missing $10?

(Yes, I know this is similar to the missing $1 riddle but want a little more simpler answer.)
 
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