Question : 20% of $a$ = $b$, then $b$% of 20 is the same as of:

Option 1: 8% of $a$

Option 2: 40% of $a$

Option 3: 4% of $a$

Option 4: 80% of $a$

Question : If 8% of $x$ = 4% of $y$, then 20% of $x$ is:

Option 1: 10% of $y$

Option 2: 16% of $y$

Option 3: 40% of $y$

Option 4: 80% of $y$

Question : A shopkeeper sells a table at a discount of 20% and earns a profit of 60%. If he sells the same table at a 40% discount, then what will be his new profit percentage?

Option 1: 20

Option 2: 30

Option 3: 35

Option 4: 40

Question : If $a+b+c=0$ and $a^2+b^2+c^2=40$, then what is the value of $a b+b c+c a$?

Option 1: –30

Option 2: –20

Option 3: –25

Option 4: –40

Question : If $a^3+3 a^2+3 a=63$, then the value of $a^2+2 a$ is:

Option 1: 22

Option 2: 19

Option 3: 15

Option 4: 8

Question : If $2apq=(p+q)^{2}-(p-q)^{2}$, then the value of $a$ is:

Option 1: 2

Option 2: 1

Option 3: 4

Option 4: 8