The US never made 40%-silver dimes. All dimes up till 1964 were 90% silver. All circulating dimes 1965 and later are copper-nickel.
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For the 1965-70 Kennedy half, it's currently worth a little over $4. Then with the silver collectable Eisenhower dollars, those are worth about $9. No smaller denominations come in 40% silver.
To find 40 percent of a value, multiply the value by 0.4. In this instance, 0.4 x 58 = $23.20.
Yes the coin is 40% silver.
0.4
The 1937 Winged Head or "Mercury" dime is worth about $0.99-$2.50 However, proof or mint state coins can be worth $40+++