#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using mint = atcoder::modint1000000007;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, m, p;
    cin >> n >> m >> p;
    vector<int> a(n);
    for(auto &&v : a) cin >> v;
    vector<mint> fact(n + m), inv(n + m);
    fact[0] = 1;
    for(int i = 1; i < n + m; i++) fact[i] = i * fact[i - 1];
    inv.back() = 1 / fact.back();
    for(int i = inv.size() - 1; i >= 1; i--) inv[i - 1] = i * inv[i];
    mint ans, s, rem, P = mint(100 - p) / 100, coef = (1 - P).pow(m--);
    sort(a.rbegin(), a.rend());
    for(int i = 0; i < n; i++){
        mint tmp = fact[m + i] * inv[i] * coef;
        ans += tmp * s;
        rem += tmp;
        coef *= P;
        s += a[i];
    }
    ans *= inv[m];
    ans += (1 - rem * inv[m]) * s;
    cout << ans.val() << '\n';
}