Hello,

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 !