Module 1 Flashcards
In%
- 1/8, 2/8, 3/8
- 1/11, 2/11, 3/11
- 1/9, 2/9, 3/9
- 1/7, 2/7, 3/7
- 1/6
- 12.5%, 25%, 37.5%
- 09.09%, 18.18%, 27.27%
- 11.11%, 22.22%, 33.33%
- 14.28%, 28.56%, 42.94%
- 16.66%
Effective% change?
a + b + ab*1/100
A is 10% less than B
Then A is?
Eg: find c if 90 is 25% less than c?
90% of B
90 = 75% of c c = 120
If the numerator of a fraction is increased by 20% and its denominator decreased by 10% the fraction becomes 3/2 what is the value of the original fraction?
120/90 * x = 3/2
X = 9/8
If principle is double then interest?
If principle is triple then interest?
100%
200%
Compound interest?
P(1+r/100) ^n
Use multiplying factor to calculate.
Eg: 11 %
100+11 = 111
Then, divide by 100, 1.11
P = 100 r = 20% n = 3
100* (1.2)^3
100* 1.728 (before 3 places)
172.8
CI of first year is 200
At 10%
Then of 2nd and 3rd year??
10% of 200 + 200= 220 (2nd year)
10% of 220 + 220 = 242 (3rd year)
- there is not much difference between CI and SI so if you are to find CI find SI and then approximate value would be the CI.
If CI become 3 times itself in 3 years.
Then in how many years 9 times?
3^2 = 9
So time 3*2 = 6years
Discount on?
Profit/ loss on?
MP
CP
Quantity profit?
Goods left/ goods sold *100
CP of 24 apples = SP of 18 apples
Then profit?
Either use quantity profit method.
Or.
LCM of 18,24 = 72
72/24= 3 (CP)
72/18= 4 (SP)
Profit: 1/3 *100= 33.33%
Buy 2 get 1 free.
Discount offered?
Free/total *100
1/3*100 = 33.33%
CP 1000
Increase by 10% then decrease by 20% and again increase by 10%.
Net change?
Use multiplying factor:
10001.10.8*1.1
968
If 2 litre water mixed in 8 litre milk, then, profit?
2/8*100 = 25%
If profit = SP of n articles
If profit = CP of n articles
Q. Saurabh sold 250 cycles and had a gain equal to the selling price of 50 cycles. what is his profit percentage?
Assume SP = rs 1 of each article
Assume CP = rs 1 of each article
Ans: let SP be 1, then total SP = 250
And gain, 50.
Thus, CP = 250-50 = 200
profit = 50/200 * 100 = 25%
Profit of article 1 = x
Profit of article 2 = y
Average profit is z
Then ratio of their CP?
x y
z
(y-z) (x-z)
Ratio of CP: y-z
———
x-z
A dealer wants to on 25% profit on an article after offering 50% discount to the customer if the market price of the article is 500 then the cost price of the article must be?
MRP - dist = CP + profit
500 - 250 = CP + 125CP/100
250 = CP + 5CP / 4
Thus, CP = 200
A man sold an article at a profit of 10% If he had charge Rs 45 more his profit percentage would have been 25%?
CP?
110% of CP + 45 = 125% of CP
Thus, CP is 300
A milk man makes a profit of 20% by selling his milk. One find day he decided to mix 10% water to his milk. what will be his profit percentage on the particular day?
a+b+ab/100
20+10+200/100
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