12,000miles; 5%increase

Find 5% of 12000 then add that to 12000

percent means parts out of 100 so 5%=5/100=0.5/10=0.05/1=0.05

5% of 12000

'of' means multiply so

0.05 times 12000=600

add this to 12000

12000+600=12600

the answer is 12600 miles