Answer:

(i) C.P. of the watch = Rs 540, S.P. of the watch = Rs 585

Profit = S.P. — C.P.

= Rs 585 — Rs 540 = Rs 45

Profit percentage = ( Profit/C.P. x 100) %

= (45/540 X 100 ) %

= 10/012 %

= 2/53 %

= 8⅓ %

(ii) llet the marked price of an electric fan be Rs. X

Mareked price - Discount = Selling price

Then, according to the question.

x - (x×9)/100 = 728

x/1 - 9x/100 = 728

taking LCM of dominators and solving it

(100x - 9x)/100 = 728

91x/100 = 728

91x = 72800

x = 72800/91

x = 800

show the Marked price of the electric fan is rupees 800

(iii) given digit number = 39

number we get by reversing the digit is sum of the numbers 39 + 93 = 132

sum of the DIGITS of 39 or 93 = 9 + 3 = 12

to FIND the coefficient of 132 divided by 11

-¹³²- =12

¹¹

(iv) prime factors of 686 = 2 × 7 × 7 ×7

686 = perfect cube if × 2 or ÷ 2 = 1/2

the and MAKE it has perfect cube is 1/2 or 2 number in which 686 is divided

Step-by-step explanation:

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