TCS Company Numerical Ability Percentage

Mani sells vegetables and he marks up the prices at 5% above his cost price. Also the weighing stones used by him weigh only 90% of the correct weight. Find his effective percentage of mark-up.
option
a) 15%
b) 16^2/3%
c) 14^1/2%
d) 20%

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TCS Other Question

A grocer mixes 3 varieties of Dal costing him RS.25, RS.30, RS.33 respectively per kg in the ratio of 1 : 2 : 5. He decides to sell the mixture at RS.35 per kg. Another grocer mixes the three varieties of Dal in equal proportions and sells the mixture at RS.35 per kg. If RS.350 is spent and equal quantities of both the mixtures are bought, then find the ratio of the three varieties respectively, if all that is bought is mixed up.
ooption
a) 11 : 14 : 23
b) 8 : 6 : 15
c) 1 : 1 : 1
d) 1 : 2 : 4
In a quadratic equation, (whose coefficients are not necessarily real) the constant term is not 0. The cube of the sum of the squares of its roots is equal to the square of the sum of the cubes of its roots. Which of the following is true?
option
a) Both roots are real
b) Neither of the roots is real
c) At least one root is non-real
d) At least one root is real