Please help me with this question (about unearned rev. & Rev.), show explanation, thank you!

During 2017, Fred worked hard to attract new business. In November, he managed to sign a contract with Simcoe Toys (ST) that would see MI selling 500,000 kg of recycled plastic to ST over the next two years at a price of $2 per kilogram. Fred is quite excited about the contract and the fact that ST paid $200,000 in advance of the start of production. The amount was received December 1, 2017. As of December 31, 2017, MI had produced and delivered 50,000 kg of recycled plastic to ST. You noted to Fred that it appears that the $200,000 deposit was recorded as revenue. Fred has asked you if there is anything wrong with that entry. If there is, he would like to know why and for you to make any correcting entry that you feel is appropriate.