Calculate without a calculator.

a) [[$ 1.035 + 9.8 + 10 ≈ $]]

b) [[$ 74.40 + 100.6 + 0.92 + 1.1 ≈ $]]

c) [[$ 9.65 - 8.78 ≈ $]]

d) [[$ 10 - 4.67 ≈ $]]