First 100 units = 24p per unit Remaining units = 16p per unit Mrs. Watt checks her electricity bill. Here are her meter readings. New reading: 7143 units Old reading 6997 units (A) User subtraction to calculate the number of units used. (B) Calculate the cost of the number of units used
Accepted Solution
A:
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 unitRemaining units = 16 p per unitNew reading = 7143 unitsOld reading = 6997 unitsDifference 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 usedThere are 146 unitsFor the first 100 units = 24 p per unitFor the remaining i.e. 146-1400 = 46 units , cost = 16 p per unitTotal 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.