A six-month $3600 treasury bill sold for $3411. What was the simple annual discount rate?

Can some one explain this i got sent this. is this a threat i’m scared

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.

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?