Foundation
USE WHEN
Value of asset/machine/property changes repeatedly by a percentage.
BEST METHOD
Factor Cancellation
TARGET
60–90 sec
MASTERY
not started
Value of asset/machine/property changes repeatedly by a percentage.
Appreciation and depreciation are compound change problems.
For varying annual rates, multiply annual factors instead of using a single-power formula.
Spot when appreciation and depreciation factors cancel, e.g., 0.8 × 1.25 = 1.
Timed drill
Identify the base or invariant before you calculate.
Attempt first · Standard Example
Attempt first · CAT-Level Example
3-level practice ladder
Foundation
CAT Standard
Advanced / Hybrid
cat 2021 slot 2: investment loses a percentage in year 1 and grows by a related percentage in year 2.