Tenzing Corp. offers a set of building blocks to customers who send in three codes from Tenzing cereal, along with $1. Tenzing purchased 200,000 building block sets in 2020 for $4.50 each, and paid for them by cash. During 2020, Tenzing sold three million boxes of cereal for $3 per box. Tenzing expects 30% of the codes to be sent in, and in 2020, 240,000 codes were redeemed. Required: Prepare all necessary journal entries for 2020, and Tenzing corp. follows ASPE and prefers to use the expense approach.