foo.c: In function 'main':
foo.c:7:20: warning: format '%f' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
    7 |         printf("%.2f",(a/20-m)*k);
      |                 ~~~^  ~~~~~~~~~~
      |                    |          |
      |                    double     int
      |                 %.2d

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