I attempt to substitute this transaction 13bc8f787f7c972702b6d14b8c0b36335aac5d0027800e2de277910a5eff86fb via upper price, when broadcast go back err: broadcast error, -26: inadequate price, rejecting substitute d05cdb24407169b39abfddd03ae9bef33a1eb49a7f59db4a39c19688a5af99b1, much less charges than conflicting txs; 0.00003562 < 0.00009786

I wish to understand how to calculate the minimal substitute price (0.00009786)，

the getmempoolinfo：{"end result":{"loaded":true,"measurement":42800"bytes":80705990,"utilization":253822900,"total_fee":6.57420956,"maxmempool":300000000,"mempoolminfee":0.00002600,"minrelaytxfee":0.00001000,"incrementalrelayfee":0.00001000,"unbroadcastcount":0,"fullrbf":false},"error":null,"identification":"curltest"}