C, bc you add up all x’s, which give you 4x. Then you add 0.5,1,1.5 together, which is 3.
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10000:100*11=1100 income per year
21000-10000=11000 need to have income
11000:1100=10 years will pass time
Answer
Find out the conversion factor for seconds to minutes and convert 135 seconds to minutes.
To prove
1 minute = 60 second
for seconds to minutes.

Therefore the conversion factor for seconds to minutes be

Now convert 135 seconds to minutes.

= 2.25 minutes
Hence proved