The answer is

the key word here was at least, which means the farmer wants to make the equal or more than $500. Since the corn cost $2 and its selling per pound, depending on how many pound of corn (c) and the blueberries per pound (b) which are $4, leading to the first part of the inequality.
Answer:
Step-by-step explanation:
0.035x+0.045x=427.50
0.08x=427.50
x=427.50/0.08
x=5343.75
x+x+1500=5343.75
2x=5343.75-1500
2x=3843.75
x=1921.88 first
1921.88+1500=3421.88 second