Question

plz answer step by step
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Answer 1

Step-by-step explanation:

1. cost of each phone = 8000

cost of 4% on 1st phone = 320

profit of 8% on second phone = 640

total profit = (640-320)

= 320

total gain percent =320x100/8000

hence answer was 4

2.MP =Rs 940

SP = Rs799

discount =Rs940-Rs799

=Rs 141

Answer 2

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Answer:

1)

Given:

Cost price(CP) of each article=Rs. 8000

Profit of 8% on TV

Loss of 4% on VCR

Cost price of TV =Rs. 8000

Profit on TV = Cost price × profit %

Profit on TV =8% of 8000

=8000× 8/100

=80×8

=Rs. 640

Cost Price of VCR =Rs. 8000

Loss on VCR = Cost price × Loss %

Loss on VCR=4% of 8000

=8000× 4/100

=80×4

=Rs. 320

Since profit is more than loss,

Hence, the shopkeeper gains net profit

Net Profit=640−320=Rs. 320

Now

Total cost Price of both article=8000+8000=Rs. 16000

Profit(%)= C.P/profit×100

Profit (%)= 16000/320×100

Profit(%)= 16/32

Profit(%)=2%

Hence, the gain in the whole transaction =2%.

2). MP=₹940 SP=₹799. So discount =₹940-₹799=₹141.

3)Answer: ptr/100 =SI. P=2000/-, T=2yrs,R=4•/• . ptr/100=2000×2×4/100=160.

4)

2,700-8/100 =2,484

so answer is ₹2,484

5)Let us suppose the number to be x.

As per the first case, the number is increased by 20%

Hence: x+ ((x*20)/100)

Resultant number is ‘6x/5’

As per the second case, resultant number is then decreased by 20%

Hence : (6x/5) - (((6x/5) * 20)/100)

Which is (6x/5) - (6x/25) = 24x/25.

The original number being x, we witness a net decrease in the overall process as (24x/25) is less than x.

Therefore Net decrease_

x - (24x/25)= x/25

Net decrease in percentage= (Net Decrease/ Initial Value) * 100%

Thus, ((x/25)/x) * 100% = 4%

So, the answer is 4%.

6). 451.20

7). Compound Interest =[Principal[1+ Rate%/100 ]time ]− Compound Interest

So we know that

Principal =Rs6250

Rate %=16%

Time =2 years

C.I=P[1+ R/100] T−C.I

=6250[1+ 16/100]2−6250

=6250[1+ 4/25 ] 2 −6250

=[6250× 29/25 × 29//25 ]−6250

=8410−6250

=RS2160(Anu)

8). Let compound interest be C.I. , Principal be P, rate be r, time be t and n is the no of times interest to be compounded.

then,C.I. = P(1+r/n)^nt - P

Here P = 48000 ; r = 0.08 ; n = 2 and t = 1

Substituting the value we get 3916.80

10). Enrollment in 2014=1500

1%of 1500=1500/100=15

Enrollment increased in 2015=15%

15%=15×15=225

15%=225

Total enrollment = 1500+225=1725