if Daniels dad and mom give him 500 dollars each then you have 1000 right then he goes and buys a ipad air for 970 then you have 30 dollars left then daniel gives his mom and dad 10 dallars each and he keeps 10 then he ows them 490 each so 490+490 = 980 then he puts his ten in there, but then there is 990 where is the last ten dallars