A: They spent 126.4 yuan.

(2) 12+24×2+30+98,

= 12+48+30+98,

=90+98,

= 188 (yuan);

188×80%= 150.4 (yuan);

A: They spent 150.4 yuan.

(3)7-3-3= 1 (block);

1÷7= 17;

A: The probability of winning the first prize is 17.