Agrapefruit has 110% of the recommended daily amount of vitamin c. the recommended daily allowance is 60 milligrams. how many milligrams of vitamin c does a grapefruit provide?
6,600 mg
66 mg
1.83 mg
183 mg

Asap! i'm not good math and i'm lost.

Can someone explain to me how to do

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.