23 Luke invested £4000 in a savings account for 3 years.
Compound interest was paid at a rate of 1.8% each year.
Alexa also invested £4000 in a savings account for 3 years.
Simple interest was paid at a rate of 1.8% each year.
Luke got more interest than Alexa in total over the 3 years.
How much more?
You must show all your working.

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?