VARYVIA GUIDES
Understand the calculation.
Short, original guides that explain the method behind useful everyday calculations.
How to calculate percentage increase
Learn the percentage increase formula, when to use it, and how to avoid common denominator mistakes.
Read guide →Discount then tax: which comes first?
Understand how a discount and sales tax combine and why the order matters.
Read guide →Weighted average explained with a simple example
See how weights change an average and how to calculate a weighted result correctly.
Read guide →Working days vs calendar days
Know the difference between elapsed calendar days and working days before planning a deadline.
Read guide →How to calculate a tip and split the bill
Calculate the tip, final total and per-person amount in a few clear steps.
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