Question

1.A sum of rupees 1000 was paid as the interest on a loan of rupees 20000 what was the amount paid back?

2.find the simple interest on rupees 400 for 2 years at the rate of 4% per annum also find the amount!

3. In a class test containing 15 questions 5 marks are awarded for every correct answer -2 marks for every incorrect and 0 marks questions not attempted!
1. Raju gets 6 correct and 6 incorrect answer what is his score?
2. Manish gets 7 correct and 8 incorrect answers what is his score?​

Answer 1

1. Answer

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Given,

Loan amount = Rs. 20000

Interest amount = Rs. 1000

To find,

The total paid back amount.

Solution,

We can simply solve this mathematical problem by using the following mathematical process.

The total paid back amount for the case of any loan will be :

Total paid back amount = Loan amount + Interest amount

By, putting the given values, we get :

Total paid back amount = 20000+1000 = Rs. 21000

Hence, the amount paid back is Rs. 21000

2. S.I = PTR / 100

= 400*2*4 / 100

= 3200 / 100

= 32

3. its answer is in the attachment

1.Heena get 2 correct answer = 5\times2=\ 105×2= 10

Heena get 5 incorrect = 5\times\left(-2\right)\ =\ -105×(−2) = −10

Total score = 10\ -10\ =\ 010 −10 = 0

Thus, total score of heena is zero.

Answer 2

Answer:

$1)paid \: back \: amount = \\ \: \: \: interest + loan \\ = 1000 + 20000 = 21000 \: rupees$

$2)S.I= \frac{PRT}{100} = \frac{400 \times 4 \times 2}{100} = \frac{3200}{100} = 32$

$total \: amount = \\ principal + simple \: interest \\ = 400 + 32 = 432 \: rupees$

3) (i) Mark's Raju got for correct answer=6×5=30

Mark's Raju got for incorrect answers =6×-2=-12

Total Mark's Raju got =30+(-12)=18 marks

(ii) Mark's Manish got fot correct answer =7×5

=35 marks

Mark's Manish got for incorrect answer

=8×-2= -16 marks

Total Mark's Manish got = 35+(-16)=19 marks