Seastrand Oil Company produces two grades of gasoline: regular and high octane. Both gasoline's are produced by blending two types of crude oil. Although both types of crude oil contain two important ingredients required to produce both gasolines, the percentage of important ingredients in each type of crude oil differs, as does the cost per gallon. The percentage of ingredients A and B in each type of crude oil and the cost per gallon are shown

Crude Oil Cost Ingredient A$.$ Ingredient B

$0\mathrm{.}10,20\%.60\%$

$0\mathrm{.}15.50\%$

Each gallon of regular gasoline must contain at $40\%$ of ingredient A$,$ whereas each gallon of hight octane can contain at most $50\%$ of ingredient B$.$ Daily demand for regular and hight octane gasoline is $800,000$ and $500,000$ gallons, respectively. How many gallons of each type of crude oil should be used in the gasolines to satisfy daily demand at a minimum cost?