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(a) 25 %

(b) 150%

(c) 20%

(d) 5%

Q.5.    Find the whole quantity if(a) 5% of it is 600. (b) 12% of it is Rs 1080. (c) 40% of it is 500 km. (d) 70% of it is 14 minutes. (e) 8% of it is 40 litres.

(a) Let the whole quantity be X
Therefore, 5 % of X = 600

Thus the required whole quantity is 12000

(b) 12 % of X = Rs 1080

(c) 40 % of X = 500 km

(d) 70% of X = 14 minutes

(e) 8 % of X = 40 litre

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Q: 4 Find: (a) 15 of 250          (b) 1 of 1 hour          (c) 20  of Rs 2500          (d) 75 of 1 kg

Here per cent implies for ()

Therefore,
(a) 15% of 250

= 37.5

(b) 1 of 1 hour
= 1  of 60 minutes

(c) 20  of Rs 2500

(d) 75 of 1 kg
We know that 1kg = 1000 gm, therefore,

=0.75 kg

Q.11.    If Meena gives an interest of Rs 45 for one year at 9% rate p.a. What is the sum she has borrowed?

Given that,
Principal =?
Interest = Rs 45
Time = 1 year

Rate= 9% p.a

Therefore,

Hence she borrowed total Rs 500

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Q.10.    What rate gives Rs 280 as interest on a sum of Rs 56,000 in 2 years?

Given that,
Principal = Rs 56,000
Interest = Rs 280
Time = 2 year

Rate= ?

Therefore,

Q.9.    Find the amount to be paid at the end of 3 years in this case:          (b) Principal = Rs 7,500 at 5% p.a.

Given that,
Principal (PA)= Rs 7,500 at 5% p.a. (Rate of interest)
and T = 3 year
We know that,

Now, putting the values in the above equation, we get

So, Amount = PA + PI = 7,500 + 1125 = Rs 8625

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Q.9.    Find the amount to be paid at the end of 3 years in this case:           (a) Principal = Rs 1,200 at 12% p.a.

Given that,
Principal (PA)= Rs 1,200 at 12% p.a. (Rate of interest)
and T = 3 year
We know that,

Now, putting the values in the above equation, we get

So, Amount = PA + PI = 1200 + 432 = Rs 1632

Q.8.    Amina buys a book for Rs 275 and sells it at a loss of 15%. How much does she sell it for?

Here we have,
CP of the book = Rs 275
Loss = 15%

We know that,

Hence the required selling price is Rs 233.75

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Q.7.(ii)    If in a stick of chalk, carbon is 3g, what is the weight of the chalk stick?

We have the weight of the carbon = 3g
Therefore, the weight of the chalk

Hence the weight of the chalk is 25g

Q.7.(i)     Chalk contains calcium, carbon and oxygen in the ratio 10:3:12. Find the percentage of carbon in chalk.

We have,
The ratio of calcium, carbon and oxygen in the chalk = 10 : 3: 12
Now, Sum of the ratio = 10 + 3 + 12 = 25

Therefore, the percentage of carbon in the chalk