A worker is paid a regular rate of Rs.30 for completing a survey. The worker completes 100 surveys per week. For any survey involving the use of her cellphone, she is paid at a rate of that is 20% higher than her regular rate. If she completed 50 surveys involving the use of her cellphone, how much did she get that week?	Choose one.
A) 2200
B) 1100
C) 2500
D) 2800
E) 3300

Rationale: "amount earned using her cell phone = 50 * 36 = 1800 earned for remaining surveys = 50 * 30 = 1500 total earning = 3300 answer : e"
Answer: E