Problem Set 4A worked through
JR Tutorials · YouTube
The textbook problem set solved, covering both the GST and the shares halves.
Financial Planning
Chapter 4 of Algebra, SSC Std 10 (English Medium). A short revision read — free, no sign-up.
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Practice Set 4.1 on GST
Yogesh Sir's Backbenchers · YouTube
Tax invoices and GST calculations worked sum by sum.
Practice Set 4.1, the harder questions
Practice Set By Sk Class · YouTube
Questions 5 to 7 of the practice set, where the trading-chain sums start.