Sheffield Frosted Flakes Company offers its customers a pottery cereal bowl if they send in 3 boxtops from Sheffield Frosted Flakes boxes and $1. The company estimates that 60% of the boxtops will be redeemed. In 2018, the company sold 1364000 boxes of Frosted Flakes and customers redeemed 630000 boxtops receiving 210000 bowls. If the bowls cost Sheffield Company $3 each, how much liability for outstanding premiums should be recorded at the end of 2018?