Monthly card? (28.8 yuan) You can get diamonds 30*45+288= 1638 in one month.
Zhou Ka (6.8 yuan) can get diamonds 35*7+68=3 13 a week.
Number of diamonds given away
The amount of Zhou Ka divided by the monthly card is 4.235294117647509 times, and then multiplied by the number of diamonds in Zhou Ka to get 1325.6.
In summary, the monthly card is more cost-effective.