Combining multiple IF THEN statements

hi ktbb0312. do up a table somewhere say in H2:I2.
0 0
90 -1
120 -2
150 -3
180 -4
210 -5
240 -6
270 -7
300 -8
330 -9
360 -10

then simply:
=LOOKUP(C3,$H$2:$H$12,$I$2:$I$12)*B3

to avoid the table:
=LOOKUP(C3,{0;90;120;150;180;210;240;270;300;330;360},{0;-1;-2;-3;-4;-5;-6;-7;-8;-9;-10})*B3