I'm trying to calculate degree of tax for car CO2 emissions. There are
several conditions I need to take into account.

1. Fuel type (D=diesel, G=gasoline) - column A
2. Actual Emissions - column B
3. Emission level: lower than 3, 3, 4 or higher than 4 - column C
4. Level of particles in disel engine, higher or lower than 0.005 g/km (Yes
or No)
5. Calculating degree of tax - column E

A B C D E

1 G 117 4 N %
2 D 193 3 Y ....
3 G 131 5 N

Degree of tax for Gasoline and Diesel engines is set as following:

Gasoline(% tax) Diesel (%tax)
CO2 emission(g/km)

0<=110 1 2

110<120 2 4

120<140 3 5
140<150 5 7
150<170 8 11
170<190 12 15
190<210 16 19
230 20 23

I got so far with the formula:
=(IF(A1="D";IF(B2<=110;2;IF(B2<=120;4;IF(B2<=140;5 ;IF(B2<=150;7;IF(B2<=170;11;IF(B2<=190;15;IF(B2<=2 10;19;23)))))));IF(B2<=110;1;IF(B2<=120;2;IF(B2<=1 40;3;IF(B2<=150;5;IF(B2<=170;8;IF(B2<=190;12;IF(B2 <=210;16;20))))))))

This actually works fine. Problem occurs when I have to use other 2
conditions (in column C and D). Namely if in column C value is less then 3,
3% tax is added to result in column E. If value is 3, 2% is added and if
value is 4, 1% is added, if value is 4 nothing is added. Condition in column
D applies only to diesel engines: if value is Y, additional 2% is added to
column E, in value is N nothing is added.

This is just to complicated for me therefore your help woul be highly
appriciated.