#include <bits/stdc++.h>
using namespace std;
#define endl ("\n")

#define mod 1e9+7
#define int long long
#define float double
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define all(c) c.begin(), c.end()
#define min3(a, b, c) min(c, min(a, b))
#define min4(a, b, c, d) min(d, min(c, min(a, b)))
#define rrep(i, n) for(int i=n-1;i>=0;i--)
#define rep(i,n) for(int i=0;i<n;i++)
#define fast ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);



int32_t main(){
    fast
    int t=1;
    cin>>t;
     while (t--){
     int n,k;cin>>n>>k;
     int a[n];rep(i, n)cin>>a[i];
    int sum=a[0],ans=0;
    for(int i=1;i<n;i++){
         int x =(a[i]*100)-(k*sum);
     if(x>0)x=ceil((double)x/k);
    else x=0;
    sum+=(a[i]+x);
    ans +=x;
    }
    cout<<ans<<endl;
     }
    return 0;
}