Answer: a) 146 units used b) the cost of the number of units used is 3136 p.
Step-by-step explanation:
Since we have given that
First 100 units = 24 p per unit
Remaining units = 16 p per unit
New reading = 7143 units
Old reading = 6997 units
Difference between the readings would be
[tex]7143-6997\\\\=146[/tex]
So, there are 146 units used.
(B) Calculate the cost of the number of units used
There are 146 units
For the first 100 units = 24 p per unit
For the remaining i.e. 146-1400 = 46 units , cost = 16 p per unit
Total cost of the number of units used is given by
[tex]24\times 100+46\times 16\\\\=2400+736\\\\=3136\ p[/tex]
Hence, a) 146 units used b) the cost of the number of units used is 3136 p.
