$A$ fruit-seller buys $x$ guavas for $Rs. y$ and sells $y$ guavas for $Rs. x$. If $x > y$,then he made:

Kamal has some apples. He sold $40\%$ more than he ate. If he sold $70$ apples,how many did he eat?

$A$ shopkeeper purchased $150$ identical pieces of furniture at the rate of $Rs. 250$ each. He spent an amount of $Rs. 2500$ on packing. He fixed the price of each furniture at $Rs. 320$. However,he decided to give a discount of $5 \%$ on the labeled price. What is the percent profit earned by him (in $\%$)?

$A$ shopkeeper sells two watches for $Rs. 308$ each. On one he gets $12 \%$ profit and on the other $12 \%$ loss. His profit or loss in the entire transaction was

In these questions,two equations numbered $I$ and $II$ are given. You have to solve both the equations and mark the appropriate option.
$I.$ $3x^2 - 13x + 12 = 0$
$II.$ $2y^2 - 15y + 28 = 0$

$A$ wholesaler had $200$ dozens of mangoes. He sold some of these mangoes at $20 \%$ profit and the rest at $10 \%$ profit,so that he made $13 \%$ profit on selling all the mangoes. How many mangoes (in dozens) did he sell at $20 \%$ profit?