Can someone please help me​

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population,find the population standard deviation, o.79828588912497

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

Astore has clearance items that have been marked down by 60%. they are having a sale, advertising an additional 55% off clearance items. what percent of the original price do you end up paying?