4.1 Chapter Summary Checklist

Before moving to the practice sets, confirm you can do each of the following without referring back to Section 2:

• Convert instantly between CP and SP given a profit% or loss%, using the multiplying factor (100+p)/100 or (100−l)/100.
• Distinguish MP from SP, and compute discount% correctly on MP (never on CP).
• Combine two or three successive discounts using a + b − ab/100, without adding them directly.
• Recall and apply the false-weight formula Profit% = [(1000−w)/w] × 100 in both directions (given w, find profit%; given profit%, find w).
• Instantly recognise the “same SP, x% profit and x% loss” pattern and write down the net loss as x²/100% without setting up equations.
• Compute overall profit/loss on a mixed lot using total CP vs total SP (or the CP-weighted average shortcut), not a plain average of two percentages.
• Set CP = 100 as the default starting assumption whenever a question gives only percentages or ratios.
• Set up a partnership profit ratio using Capital × Time for each partner, not capital alone.

If any box above feels shaky, re-read the corresponding sub-section in Section 2 once more before attempting Set B — the moderate-level questions assume fluency in all eight points.