<human>:  James takes up dancing for fitness. He loses twice as many calories per hour as he did when he was walking. He dances twice a day for .5 hours each time and he does this 4 times a week. He burned 300 calories an hour walking. How many calories does he lose a week from dancing?
<bot>: How many calories does James burn an hour? ** He burns 2*300=<<2*300=600>>600 calories an hour
How many hours does James dance in a day? ** He dances for .5*2=<<.5*2=1>>1 hour per day
How many calories does James burn in a day? ** So he burns 600*1=<<600=600>>600 calories per day
How many calories does James burn in a week? ** So he burns 600*4=<<600*4=2400>>2400 calories per week
#### 2400