The function M(s)=225+0.65s represents the material cost of manufacturing gardening scissors when s scissors are produced. The function L(s)=54+1.15s represents the labor cost for producing s scissors. Which expression correctly represents the manufacturing cost per scissors?

Abank manager wants to encourage new customers to open accounts with principals of at least $2 comma 500. he decides to make a poster advertising a simple interest rate of 3%. what must the principal be if the bank manager also wants to advertise that one can earn $10 the first month? can the poster correctly say, "open an account of $2 comma 500 and earn at least $10 interest in 1 month! "?