Final answer:
The GDP for the economy is $1690, which is calculated by multiplying the quantities of each good produced by their respective prices and summing them up.
Step-by-step explanation:
The Gross Domestic Product (GDP) of an economy is the total value of all final goods and services produced in a year. To calculate GDP, we multiply the quantities of each good produced by their respective prices and sum them up. In this case, the quantities are 10 pens, 20 shirts, and 30 radios, and their prices are $4, $30, and $35 respectively.
GDP = (10 pens * $4/pen) + (20 shirts * $30/shirt) + (30 radios * $35/radio)
GDP = $40 + $600 + $1050 = $1690
Therefore, the GDP for the economy is $1690.