SALE PRICE
After discount • before discount • or percent off
Use multipliers • NO SCROLL
SOLVE FOR
SALE
Pick the unknown
ROUNDING
2DP
Money usually 2dp
ORIGINAL (£)
£
Needed for SALE / %
SALE (£)
£
Needed for ORIGINAL / %
DISCOUNT %
25%
Used for SALE / ORIGINAL
MULTIPLIER
×0.75
×(1 − p)
WORKING
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SALE PRICE
READY
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SOLVE FOR
SALE
Pick the unknown
ROUNDING
2DP
Money usually 2dp
ORIGINAL (£)
£
Needed for SALE / %
SALE (£)
£
Needed for ORIGINAL / %
DISCOUNT %
25%
Used for SALE / ORIGINAL
MULTIPLIER
×0.75
×(1 − p)
WORKING
—
—
—
—
—
SALE PRICE
READY
—
PAGE 1/2
HOW TO USE
1) Choose SOLVE FOR
2) Enter the values you know
3) Press SOLVE
4) Use multipliers to be fast
SALE PRICE
S = O × (1 − p)
Example: £80, 25%
S = 80×0.75 = £60
ORIGINAL PRICE
O = S ÷ (1 − p)
Divide by the multiplier
DISCOUNT %
p = (O − S) ÷ O
p% = p × 100
Always divide by ORIGINAL
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