Given amount earned over the four weeks= ₹ 129, ₹ 139, ₹ 155, ₹ 176

We know the formula,

 $\mathrm{Average} \left(\mathrm{A}\right)=\frac{\mathrm{Sum} \mathrm{of} \mathrm{given} \mathrm{values} \left(\mathrm{S}\right)}{\mathrm{Total} \mathrm{number} \mathrm{of} \mathrm{values} \left(\mathrm{N}\right)}$

 Here,

 Sum of given values(S)

= 129+139+155+176

= 599

Total number of values(N)= 4

Substituting these values we get (A),

 $= \frac{599}{4}=149.75$

Hence, Option D is correct.