Let's take the following example:
Bicycle: 10€*7,06%=0,71€
Surfboard: 7€*4,63%=0,32€
Total insurance cost: 0.71+0.32=1.03€
Base value: 3€
Total: 4,03€
Where 7.06% refers to the percentage of the mobility category and 4.63% to the sport category. In other words, the program calculations are managed even in case of different categories in one rental.