The percent increase x (in %) of a price N, is defined as :
N*(1+x)=N', where N' is the new price. So you just have to solve this equation with N=85.000 and N'=103.000
For the second one, name the variables.
If x is the quantity taken from the 12% cream cup, and y the quantity from the other, you have to find x and y by comparing the quantity of cream :
x*12% + y*22% = (x+y)*15%
Is there an information missing ? There are many solutions !