Engineering Economics
Which is NOT an essential element of an ordinary annuity?

The first payment is made at the beginning of the first period.
Compound interest is paid on all amounts in the annuity.
The payments are made at equal interval of time.
The amounts of all payments are equal.

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Engineering Economics
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.

1,000 feet
1,100 feet
1,120 feet
1,040 feet

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