[GAINING RATIO AND SACRIFICING RATIO]
[PROPORTION]
[PERCENTAGE]
[DISCOUNT]
[COMMISSION AND BROKERAGE]
[SIMULTANEOUS EQUATIONS]
[PREPARATION OF INVOICE]
[ELEMENTARY MATRICES]
[LOGARITHMS AND ANTILOGARITHMS]
[SIMPLE INTEREST]
[COMPOUND INTEREST]
[AVERAGE]
[PROFIT AND LOSS]
[TABLES]
SOLUTION AND SOLVED PRACTICAL PROBLEMS