Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Call sign | Frequency MHz | City of license | ERP W | Class | FCC info |
| --- | --- | --- | --- | --- | --- |
| WZAE | 93.3 | Wadley, Georgia | 4000.0 | A | FCC |
| W257BG | 99.3 | Statesboro, Georgia | 80.0 | D | FCC |
| W252BH | 98.3 | Washington, Georgia | 27.0 | D | FCC |
| W224BE | 92.7 | Sylvania, Georgia | 27.0 | D | FCC |
| W254BN | 98.7 | Sparta, Georgia | 55.0 | D | FCC |
| W245AN | 96.9 | Milledgeville, Georgia | 19.0 | D | FCC |
Question:
Name the sum of ERP W for class of d and frequency mhz of 98.7
Answer:
55.0