**Solution :-**

**41 d 42 a 43 a 44 b 45 c 46 b 47 a 48 b 49 a 50 a 51 b**

*41.(4) Required answer*

*= 95/100 × 385 = Rs. 365.75*

*42.(1) Percentage gain*

*= (24 – 21)/21 × 100 = 100/7%*

*43.(1) Let 8 kg of first variety of rice and 5 kg of second*

*variety is mixed*

*∴ Cost price of 13 kg of rice*

*= Rs. (8 × 32 + 5× 80)*

*= Rs. (256 + 400)*

*= Rs. 656*

*S.P. of 13 kg of rice*

*= 72 × 13*

*= Rs. 936*

*Gain = 936 – 656 = Rs. 280*

*Gain per cent = 280/656 × 100*

*= 43%*

*44.(2) C.P of article*

*= 1265 × 110/110 × 100/115 × 100/125*

*= Rs. 800*

*45.(3) Let the business value changes from Rs. x to Rs. y.*

*∴ 4% of x = 5% of y*

*= 4x/100 = 5y/100*

*y = 4/5x*

*Change in business*

*= (x – 4x/5) = x/5*

*∴ Percentage slump in business*

*= x/ 5 × 1/x × 100 = 20%*

*46.(2) Let the CP of the watch be Rs. x,*

*Case I*

*∴ SP = 120x / 100 = Rs. 6x/5*

*Case II,*

*CP = Rs. (x – 100)*

*SP = Rs. (6x/5 – 100)*

*Profit = (6x/5 – x) = Rs. x/5*

*∴ x/5/(x – 100) × 100 =25*

*= 25x – 2500 = 20x*

*= 5x = 2500*

*x = 2500/5 = Rs. 500*

*47.(1) Commission on 1 calculator*

*= 250 × 20/100 = Rs.50*

*Commission on1 calculator*

*= 50 × 10/100 = Rs. 5*

*∴ Required amount of commission*

*= Rs.3 ( 10 × 50 + 5 × 5)*

*= Rs. 1575*

*48.(2) Profit per cent*

*= (864 – 800)/800 × 100*

*= 64/800 × 100 = 8%*

*49.(1) 1m/150 = 0.6n /400*

*= 1m = 0.6/400 × 150n = 0.225n*

*50.(1) Gain per cent*

*= [20-15 – (20 × 15/100)]% = 2%*

*51.(1) Let C.P. of 1 fan = Rs. x*

*CP of 1 blower = Rs. y*

*CP of 1 table = Rs. 1000 (given)*

*∴ 4x + 3y = 16500 ……. (i)*

*2x + 2y + 2 × 1000 = 12000*

*=2x + 2y = 12000 – 2000*

*=10000*

*= x + y = 5000 ………… (ii)*

*y=20000 – 16500 = 3500*

*x= 5000 – 3500 = 1500*

*∴ 3x + y = 3 × 1500 + 3500*

*= Rs. 8000*