Percent problems

1003090508

Level: 
C
A factory is supplied with raw materials by rail. Due to the renovation of the track, the time of passing the goods from the warehouse to the factory increased by 25%. How much did the average speed of carriage on the delivery route decrease?
by 20%
by 25%
by 4%
by 75%

1003090507

Level: 
C
A certain amount of money was put into a bank account for an annual deposit of 3.5% per year. After a year the bank paid a tax in the amount of 14 zlotys from the gained interests. What amount was placed on the deposit if the interest tax amounted to 20%?
2000 zlotys
2500 zlotys
3000 zlotys
1400 zlotys

1003090506

Level: 
C
The interest rate on deposits in a certain bank initially equaled 5% per year but then it was decreased by 20%. By how many percentage points has the interest rate decreased?
by 1 percentage point
by 1.2 percentage point
by 2 percentage points
by 2.1 percentage point

1003090504

Level: 
C
Interest on two construction loans of the total value of 100000 zlotys amounts to 3.150 zlotys a year with the interest rate on one of the loans being 3% and the other 3.5%. Calculate the amount of each of these loans.
70000 zlotys of 3% interest rate loan and 30000 zlotys of 3.5% interest rate loan
30000 zlotys of 3% interest rate loan and 70000 zlotys of 3.5% interest rate loan
50000 zlotys of 3% interest rate loan and 50000 zlotys of 3.5% interest rate loan
80000 zlotys of 3% interest rate loan and 20000 zlotys of 3.5% interest rate loan