Buku hitung · everyday numbers

Bantuhitung

Everyday calculators that show the working: inputs, formula, result, and source.

Sample content — replace these figures and sources with your own.

Problem 01

Home electricity

Given

Appliance power (W) Hours used (per day) Electricity tariff (Rp/kWh)

Formula

E = P × t ÷ 1000 = 100 × 6 ÷ 1000

Biaya = E × 30 × 1,445

Answer

Energy 0.6 kWh per day

Cost Rp 26,005 per month

One worked example for every number you meet in a day.

Watts and hours become kWh and rupiah.

Portions, protein, and what a day needs.

Protein mix and feed cost per head.

Note

The formula, the units, the source.

No black boxes: each tool writes out how it got there, and where the numbers come from.