A trader dealing in pressure cookers reduced the price by 20% as a result of which his sale went up to 80 % What was the net effect on his sales income?
(A) 44% decrease
(B) 44% increase
(C) 66% increase
(D) 66% decase
A rectangular field has its length and breadth in the ratio 5:3. It's area is 3.75 hectars. Find the cost of fencing it at rupees 5 per metre.
(A) 400
(B) 4000
(C)1000
(D) 500
What must be added to y^2 + 5y-6 to get y^3-y^2+3y-2
(A) y^2-2y+4
(B) y^3- 2y^y? - 2y + 4
(C) y^3 +2y^2- 2y +4
(D) -y^3-2y^2 +2y - 4
Answers
1)Increase% -- decrease% -- (increase%*decrease%/100).
So,
80 -- 20 -- (80*20/100).
80-20-16= 44%( which is +ve which 44% increase).
2)B) Rs.4,000
3)D)
Answer:
A trader dealing in pressure cookers reduced the price by 20% as a result of which his sale went up to 80 % What was the net effect on his sales income?
(A) 44% decrease
(B) 44% increase☑️☑️
(C) 66% increase
(D) 66% decase
Solution :- overall effect = -20+80-20*80/100 = 44% inc (B)
A rectangular field has its length and breadth in the ratio 5:3. It's area is 3.75 hectars. Find the cost of fencing it at rupees 5 per metre.
(A) 400
(B) 4000☑️☑️
(C)1000
(D) 500
Solution :-
Let l & b = 5x and 3x
15x² ------- 3.75 hect = 37500m²
x² -------- 2500m²
x --------- 50m
so, l = 250m & b = 150m
perimeter = 2(l+b) = 800m
cost of fencing = 800*5 = 4000 (B) (Ans)
What must be added to y^2 + 5y-6 to get y^3-y^2+3y-2
(A) y^2-2y+4
(B) y^3- 2y² - 2y + 4 ☑️☑️
(C) y^3 +2y^2- 2y +4
(D) -y^3-2y^2 +2y -4
solution :-
(y³-y²+3y-2)-(y²+5y-6) = y³-2y²-2y+4 (B) (Ans)