human
Mike wants to buy a new phone. The cost of the phone is $1300. How much more money does Mike need if he already has 40% of the amount he needs?
assistant
How much money does Mike already have? ** Mike already has 40/100 * 1300 = $<<40/100*1300=520>>520.
How much more money does Mike need? ** This means he needs 1300 - 520 = $<<1300-520=780>>780 more, to buy the phone.
#### 780