Percent problems

1003082201

Level: 
B
The price of the commodity did not change if
it was lowered by 20%, and the new price was increased by 25%.
it was lowered by 10%, and the new price was increased by 10%.
it was increased by 30%, and the new price was lowered by 30%.
it was increased by 20%, and the new price was lowered by 25%.

1003082209

Level: 
B
Two circles are given. The radius of the first circle is by 30% longer than the radius of the other circle. It means that the area of the first circle is bigger than the area of the second one
by more than 60%.
by less than 50%, but more than 40%.
by less than 60%, but more than 50%.
by exactly 60%.