For a given interest rate, simple interest varies jointly as the principal and time. if $3000 left in an account for 3 years earned interest of $540, then how much interest woukd be earned in 4 years?

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of california was approximately two times the population of florida. b. the population of florida was approximately twenty times the population of california. c. the population of florida was approximately two times the population of california. d. the population of california was approximately twenty times the population of florida.