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Gyaan Maths
CBSE · Class 6-12
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Class 8 · Ganita Prakash
Unit 8 · Class 8Ganita Prakash
Fractions in Disguise
Percentages, discounts, profit, loss, simple interest.
Lessons
3 concepts
1
Percentage Conversions
3
4
=
0.75
=
75
%
\tfrac 34 = 0.75 = 75\%
4
3
=
0.75
=
75%
. Multiply by 100 to convert fraction/decimal to percent.
2
Profit & Loss
Always express profit % on cost price. If CP = 100, SP = 120 → profit = 20 → profit % = 20%.
3
Simple Interest
I
=
P
×
R
×
T
/
100
I = P \times R \times T / 100
I
=
P
×
R
×
T
/100
where
P
P
P
= principal,
R
R
R
= rate% p.a.,
T
T
T
= time in years. Total:
P
+
I
P + I
P
+
I
.
Skills to practise
Skill · medium
Fractions in Disguise — Practice