If the cost of a pen is 8.50 and the cost of a pencil is 5.50, the total cost of 20 pens and 16 pencils is

0.007 × 0.005 = ?

77 ÷ 0.007 =

The digit in the thousands place in the number 6548.03 is

Which of the following represents descending order of numbers?

​$$\frac{0.12}{0.3} + \frac{0.015}{0.5}=?$$​​

$$\frac{0.15 × 0.15 + 0.0075}{0.1 × 0.1 + 0.005}$$​=?

245.36 + 12.475 + 98.24 = ?

0.0007 + 0.07 + 0.007 + 0.7 = ?

What is the value of ' x ' in the following equation?
​$$11^2+1.1^2+0.11^2+0.011^2=x$$​​