原式=  $$\left[ \left( 0.8+\frac{1}{5} \right)\times 24+6.6 \right]\div \frac{9}{14}-7.6$$  $$=\left[ (0.8+0.2)\times 24+6.6 \right]\div \frac{9}{14}-7.6$$  $$=\left[ 1\times 24+6.6 \right]\div \frac{9}{14}-7.6$$  $$=30.6\div \frac{9}{14}-7.6$$  $$=30.6\times \frac{14}{9}-7.6$$  $$=47.6-7.6$$  $$=40$$． 
计算$\left[ \left( 80 \%+\dfrac{1}{5}\right)\times24+6.6\right]\div\dfrac{9}{14}-7.6=$． 
Options:
- $$30$$ 
- $$40$$ 
- $$50$$ 
- $$60$$ 