Percent problems

9000085303

Level: 
B
The shop received 30 pieces of TV from the manufacturer NoName. Five TVs in this delivery were defect. The shop also received TVs from the manufacturer GoodName. All these TVs were perfect. The final inspection revealed that 10% of TVs were defect in total. Use these information to find out how many TVs have been supplied from the producer GoodName.
20
25
18
16

9000085304

Level: 
B
The final score of the hockey match between teams A and B was 2:2. The goaltender of A had success rate 90% (he stopped 90% of all shots on goal) and the goaltender of the team B had fail rate 20% (20% of all shots on goal went into his net). How many shots on goal has been in the match in total?
30
25
35
40

9000085307

Level: 
B
A machine fills 2000 bottles per hour. As a consequence of technical problems, the efficiency of the machine decreased by 10%. How many bottles can be filled by the machine with the mentioned technical problems during a time period of 8 hours?
14400
13800
14500
15200

9000078905

Level: 
B
A new laptop has been introduced to the marked with the original price $1090. Soon after the introduction the price has been increased temporarily by 20% and after several months decreased by 30%. Find the final price for the laptop. Round your result to the nearest integer.
$916
$981
$952
$930