60.5/100 if the denominator is 100 and nominator is 60.5 what is percentage?​

In a certain city, the hourly wage of workers on temporary employment contracts is normally distributed. the mean is $15 and the standard deviation is $3. what percentage of temporary workers earn less than $12 per hour? a. 6% b. 16% c. 26% d. 36%

Me i’m stuck on all these questions besides the two bottom ones

Write as a product of two polynomials. 2(3–b)+5(b–3)^2