Omega Company makes and sells jungle gyms and tree houses for children. For jungle gyms, the price is $150 and variable expenses are $100 per unit. For tree houses, the price is $180 and variable expenses are $120. Total fixed expenses are $215,250. Last year, Omega sold 10,000 gyms and 6,000 tree houses. Using the lowest whole numbers, what is the sales mix of gyms and tree houses?

a.4:1

b.2:3

c.5:3

d.3:2

e.1:4