Question

Q4
On selling a bag for Rs 704, a shopkeeper suffers a loss of 12%. At what price
should he sell it to gain 7.5%?
Q5
A shopkeeper purchased an article for Rs 1200. He sells it at a discount of 10%
and still makes a profit of 8%. Find:
(i) the selling price
(ii) the markede
Q6
Expand the following:
(i) (4+3x)(4-3x)
(ii) (2x - 7y)
(iii) (x + 3y + 5z)2
Q7
Using the product (a + b) (a - b) = (a)2 – (b), find the value of:
(i) 507x493
(ii) 25.3x24.7
Q8 If a+b=7 and ab= 10, find the value of (a)2+(b)2
09 Find the area of triangle whose sides are 34cm, 20cm and 42cm. Hence find
the length of the altitude corresponding to the shortest side.

Answer 1

Q4. 88%= 704

107.5%=x

860Rs. when he sold at rs 860 he gain 7.5% profit.

Q5.. s.p =108% of cp

108/100*1200= 1296

Now.

M.r.p=100% =x

S.p. after 10% discount

S.p 90% of m.r.p =1296

90%=1296

100%=x

M.r.p= 1440

Q6... (i) (4+3x)(4-3x)

= 16+12x-12x-9x^2

=16-9x^2

16=9x^2

X=4/3

(ii) (2x - 7y)

2x=7y

X/y= 7/2

(iii) (x + 3y + 5z)2

2x+6y10z