book Maths Puzzle Numerical Ability

ay + 3a + 2y + 6 / ay + 3a + 5y + 15

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book Other Question

10) The year y when sales were s million dollars for a particular electronics company can be modeled by the radical equation
. . . . . ______
y=1.3/s-4-7 (That is the sqrt s a trader alows a discount of 10% on the marked price. However he still makes a profit of 17% on cost price.
Find (a) the profit % if sold at the merked price
(b) the profit % if he allows a discount of 5 % only on the marked price