we know the general equation of straight line which is y=mx+c

here, m is the slope of line and c is the intercept

by comparing the equation of line p=0.12x+3000, we come to know the slope of line p , i.e

m=0.12, and the slope of line n is 0.1 greater than line p

therefore, slope of line n=0.12+0.1

                                   = 0.22 which is the required answer