Gravitational Acceleration given mass and radius

1. The problem statement, all variables and given/known data
If you lived on a planet with five times the mass of Earth and twice the radius, what would be the gravitational acceleration at the surface of your planet?

2. Relevant equations
Mass of Earth = 6.00*10^24 kg
Radius of Earth = 6.38*10^3 km

3. The attempt at a solution
So, when I started out doing this, I quickly plugged in earth’s radius (in m), mass (in kg) and the gravitational constant just to make sure it came out at 9.8 because I know that’s what Earth’s gravitational acceleration from the surface is, but none of the answer I get are even close. I can’t even get this right and I still have to do the actual problem (using 5x the mass and 2x the radius).

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