=IF(AND(LEFT(B4,2)="DT", RIGHT(B4,1)="1"), 50,
    IF(AND(LEFT(B4,2)="DT", RIGHT(B4,1)="2"), 100,
        IF(AND(LEFT(B4,2)="DT", RIGHT(B4,1)="3"), 150,
            IF(AND(LEFT(B4,2)="KD", RIGHT(B4,1)="1"), 200,
                IF(AND(LEFT(B4,2)="KD", RIGHT(B4,1)="2"), 300, 450)))))