Until now, Mari has just focused on baking cakes that she likes, without worrying too much about what it costs to make. However, recently, her friend’s sister, who is getting married in a couple of months, asked Mari to bake the wedding cake. Mari agreed and the cake was very successful and received many compliments from the wedding guests. Since then, Mari has gotten orders from a number of other brides-to-be, but before now, she has never tried to make a profit from her cakes. However, now that she needs to earn money to support herself as a student, she realizes that she needs to work out her costs and plan to make a profit.