41. There are several coins with denominations of 1 cent, 5 cents, and 10 cents. Among them, the 5-cent coins account for $15 \%$ of the total number of coins, and the 10-cent coins account for $40 \%$ of the total amount of money. Then the percentage of 1-cent coins in the total number of coins is $\qquad$ $\%$.
answer: 75