11. “When one of the factors of production is fixed in quantity or is difficult to increase, increasing the other factors of production will result in a less than proportionate increase in output”. This statement is known as the______________?

A. Law of diminishing return
B. Law of supply
C. Law of demand
D. Law of supply and demand
✅ The correct answer is option A.

18. A telephone switchboard 100 pair cable can be made up with either enameled wire or tinned wire. There will be 400 soldered connections. The cost of soldering a connection on the enameled wire will be P 1.65 on the tinned wire, it will be P 1.15. A 100- pair cable made up with enameled wire cost P 0.55 per linear foot and those made up of tinned wire cost P 0.75 per linear foot. Determine the length of cable run in feet so that the cost of each installation would be the same ?

A. 1,000 feet
B. 1,040 feet
C. 1,100 feet
D. 1,120 feet
✅ The correct answer is option A.