If 20% of k is 10 less than 1200% of 10, then k is:

Correct option is B

Given:

20% of k = 10 less than 1200% of 10

Solution:

20% of k = 1200% of 10 - 10 

​$$\frac{20}{100} \times k = \frac{1200}{100}\times 10 - 10 \\ \ \\ 0.2k = 120 - 10 \\ \ \\ 0.2k = 110 \\ \ \\ k =\frac{110}{0.2} = 550$$​​