Name the sum of ERP W for class of d and frequency mhz of 98.7
CREATE TABLE table_70353 (
    "Call sign" text,
    "Frequency MHz" real,
    "City of license" text,
    "ERP W" real,
    "Class" text,
    "FCC info" text
)
SELECT SUM("ERP W") FROM table_70353 WHERE "Class" = 'd' AND "Frequency MHz" = '98.7'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Name the sum of ERP W for class of d and frequency mhz of 98.7 ### Input: CREATE TABLE table_70353 (
    "Call sign" text,
    "Frequency MHz" real,
    "City of license" text,
    "ERP W" real,
    "Class" text,
    "FCC info" text
) ### Response: SELECT SUM("ERP W") FROM table_70353 WHERE "Class" = 'd' AND "Frequency MHz" = '98.7'