The cost price of 16 notebooks is equal to the selling price of 12 notebooks. Find the gain per cent.

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

3/20

step-by-step explanation:

well, there are 20 outcomes, and 3 of them you want. so, 3/20

answer is c

step-by-step explanation:

81/12=324/x

x=48

1/2(2*4)=6 $$- agahajakanajak