What is the area of a triangle whose base is 15 centimeters and whose height is 10 centimeters?

im having trouble understanding, explanation would be great thx : )

Abank manager wants to encourage new customers to open accounts with principals of at least $2,500. 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! "?