Find the rate of interest, if the interest is 490 the sum(principal) is 7000 for 2 years

Rate=3.5%

Step-by-step explanation:

i=prt/100

490=7000*2*r/100

490=140r

r=490/140

r=3.5%

12.4%

Step-by-step explanation:

The results from the random sample counts 124 from a total of 1000 people that wear contact lenses. This means is the percentageof the people in the sample that wear contact lenses.Because it is a random sample, it is suppose to reflect the behavior of the total population. Then we can expect or predict  similar percentage of Americans wearing contact lenses (12.4%).