What is 24/40 as a decimal

What is the effect on the graph of the parent function f(x) = x when f(x) is replaced with 3f(x)? a) shifts the line 3 units up b) shifts the line 3 units down c) increases the slope of the line by a factor of 3 d) decreases the slope of the line by a factor of 3

10% of 1,900,000. show me how you got the answer

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?