To find out how much fruit Tina bought in total, you simply add the weight of the apples and the weight of the oranges together.
Weight of apples: 8.02 kilograms
Weight of oranges: 0.4 kilograms
Now, add them together:
\[ 8.02 , \text{kg} + 0.4 , \text{kg} = 8.42 , \text{kg} \]
So, Tina bought a total of 8.42 kilograms of fruit.