The engineer at a small factory would like to make improvements to the boiler that currently uses fuel worth R3 million each year. The boiler efficiency is currently 77%. Which of the following options will result in the shortest payback period?

Select one:

a.

Making boiler control adjustments costing R40,000, reducing fuel costs by R90,000

b.

Making changes to the system costing R40,000, reducing annual fuel costs by 1.5%

c.

Boiler recalibration costing R25,000, improving efficiency by 3%

d.

Purchasing a new boiler (same model as previous) for R2 million