At current levels of capital and labor for a firm, the cost of capital is $15 per hour, the wage paid to employees is $30 per hour, the marginal product of capital is 30 units per hour, and the marginal product of labor is 40 units per hour. Should firm change up its ratio of capital labor?

the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.

answer when little or no data is available;