Carson purchased supplies for his computer for $64. the sales tax was $4.16. he gave the salesperson $80. how much change did he receive? a. $11.84 b. $16 c. $68.16 d. $11.48 explain i wanna know how to do this

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.