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Electricity bill with slab rates

Calculate a household electricity bill where every slab of units has a different rate, plus a fixed charge.

Skills: C / Python, if-else ladders, functions

Based on how slab-wise electricity tariffs work for homes

The problem

Electricity bills for homes are calculated in slabs: the first units are cheap and later units cost more. Many people cannot check whether their bill is correct.

Use these sample rates (not an official tariff):

0 – 100 units     ₹4.00 per unit
101 – 300 units   ₹8.00 per unit
301 – 500 units   ₹11.00 per unit
above 500 units   ₹13.00 per unit
Fixed charge      ₹120 per month

For 250 units the energy charge is 100 × 4 + 150 × 8 = ₹1600, and the bill is ₹1720.

Your solution should

01Read the previous and current meter readings
02Reject a current reading smaller than the previous one
03Charge every slab only for the units that fall inside it
04Print units used, the charge for each slab, the fixed charge and the total
05Write the slab calculation as a separate function

Stuck? Show hints (3)

units in a slab = min(units, slab end) − slab start, when positive
Store slab limits and rates in two arrays and loop over them
Check your function with 0, 100, 101, 300, 301 and 750 units

Electricity bill with slab rates

The problem

Your solution should

Electricity bill with slab rates

The problem

Your solution should

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