Answer:
Dana will have to spend $47.67.
Step-by-step explanation:
Dana needs 300 pickets for her colorful picket fence.
As she needs equal amount for 4 colors, so for each color she will need
bulbs
She already has 32 red, 26 yellow, 9 green and no blues. She wants equal amounts of each of her 4 selected colors.
So, additional number of bulbs she needs are :
Red = 
Yellow = 
Green = 
Blue = 
Now, cost of 1 bulb = $0.25
You get 20% discount if you purchase 50 or more bulbs of the same color and 30% off if you purchase 60 or more of one color.
Cost for red bulbs =
dollars
Cost of yellow bulbs =
dollars
Cost of green bulbs =
dollars
After 30% off, the price becomes:
dollars
Cost of blue bulbs =
dollars
After 30% off, the price becomes:
dollars
Total cost of all bulbs =
dollars
Hence, Dana will have to spend $47.67.